The probability that exactly 7 employees out of 23 sent complete the program is 0.217 or 21.7%.
In this case, the number of trials is 23, and the probability of success is 0.4 (since, on average, 40% of those sent complete the program). We want to find the probability of exactly 7 successes.
The binomial probability formula is:
P(X=k) = [tex](^n_k) \times p^k \times (1-p)^{(n-k)}[/tex]
Where P(X=k) is the probability of k successes, n is the total number of trials, p is the probability of success, and (n choose k) is the binomial coefficient, which represents the number of ways to choose k successes from n trials.
Using this formula, we can calculate the probability of exactly 7 employees completing the program as follows:
P(X=7) = [tex](^{23} _7) \times 0.4^7 \times (1-0.4)^{(23-7)}[/tex]
= 0.217 or 21.7%
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Does anyone have the answers to Edmentum's Unit 3 Post Test: Extending to Three Dimensions?
Extending to Three Dimensions depend on the specific questions asked and can be calculated using the formula for the volume of a three-dimensional object.
The answers to Edmentum's Unit 3 Post Test: Extending to Three Dimensions depend on the specific questions asked. Generally, the test covers topics such as the definition of three-dimensional objects, the properties of three-dimensional space, and the relationships between three-dimensional figures. For example, a question might ask how to calculate the volume of a rectangular prism. To answer this, one would need to calculate the area of each of the rectangles that make up the prism and then multiply them together to get the volume. For example, if the length of the prism is 4, the width is 3, and the height is 2, the volume of the prism would be 24 (4 * 3 * 2 = 24).
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What is a global firm? A) A firm that operates in one country and exports its goods and services to foreign countries. B) A firm that operates in more than one country and has a sales and marketing staff in those countries. C) A firm that operates in more than one country and captures R&D, production, logistical, marketing, and financial advantages not available to purely domestic competitors. D) A firm that sells its products and services across the world but restricts manufacturing to the home country. E) A firm that operates in more than one country but restricts the sale of its products to the home country.
The statement "A global firm is a firm that operates in more than one country and captures R&D, production, logistical, marketing, and financial advantages not available to purely domestic competitors." is the correct .
Therefore option C is correct.
What is a global firm?
A global firm is a company that operates in more than one country and has access to research and development, production, logistical, marketing, and financial advantages that are not available to purely domestic rivals.
Global companies have expanded beyond their home country's boundaries to capitalize on the advantages of global sourcing and production.
Global companies have a variety of advantages that pure domestic companies do not have.
The following are some of the benefits of global businesses:
They are able to take advantage of cost savings in various areas, such as lower labour costs or more efficient production processes.They have access to a broader market, which means they can sell more products and services.They have access to a wider pool of resources, which can help them develop and innovate faster.They can leverage their size and reach to negotiate more favourable contracts with suppliers, customers, and other stakeholders.In conclusion, a global firm is a firm that operates in more than one country and captures R&D, production, logistical, marketing, and financial advantages not available to purely domestic competitors.
Therefore option C is correct.
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amy has 3 pound of raisins she didvides the raisins equaly into 12 bags how much puonds of rasins are in each bag :show your work
Answer:
May will have 0.25 pounds per bag.Step-by-step explanation:
We know that
Amy has 3 pounds of raisins.She wants to divide it into 12 bags.To now how many pounds will be in each bag, we have to divide
[tex]3 \ lb \div12 \ bags =0.25 \ lb/bag[/tex]
This means that May will have 0.25 pounds per bag, that is, a quarter pound of raisin in each bag.
If we divide this using the long method, we would have to add a zero to "3", because 3 is less than 12, so we have to transform it from "3" to "30". To be able to do that, we have to add a decimal point to the quotient, and then continue with the division.
Which three side length best describes the triangle in the diagram
Answer:
i think that it is d or c just guessing
Please help me find the Surface Area and Volume of this triangular prism
Surface area
2 triangles: Just do bh instead of 1/2bh, bh = 8 * 3 = 24
2 rectangles: 2bh but we first need to find h. The altitude pictured by dotted line, creates a right triangle where its hypotenuse is h. Since it also has side lengths 3 and 4, h = 5 (by pythag triplets). Then, 2bh = 2 * 12 * 5 = 120
base: bh = 12 * 8 = 96
Adding these areas we have 24 + 120 + 96 = 240
Volume: Bh (big b signifies area of the base)
B = area of the triangle = 1/2bh = 1/2 * 8 * 3 = 12
So Bh = 12 *12 = 144
Hope this helps you understand the process.
A regular sized box of a certain cereal brand has dimensions of 2 inches by 6 inches by 11 inches and cost $3.99.
The family sized version has dimensions of 3 inches by 8 inches by 15 inches and cost $5.69.
A. How many more square inches of cardboard is needed for the family sized box than the regular sized box? Show your work.
B. How many more cubic inches of cereal fit in the family sized box than the regular sized box? Show your work.
C. Which cereal costs less per cubic inch of cereal? Show your work.
The family-sized box requires 130 more square inches of cardboard than the regular-sized box, has an additional 228 cubic inches of cereal capacity, and costs less per cubic inch of cereal.
According to the given data:To calculate the additional square inches of cardboard needed for the family-sized box, we need to find the difference in surface area between the regular-sized box and the family-sized box.
The regular-sized box has a surface area of 2 x 6 + 2 x 11 + 6 x 11 = 104 square inches.
The family-sized box has a surface area of 2 x 8 + 2 x 15 + 3 x 15 + 3 x 8 + 3 x 15 = 234 square inches.
Therefore, the additional square inches of cardboard needed for the family-sized box is 234 - 104 = 130 square inches.
B. To find how many more cubic inches of cereal fit in the family-sized box than the regular-sized box, we need to calculate the difference in volume between the two boxes.
The regular-sized box has a volume of 2 x 6 x 11 = 132 cubic inches.
The family-sized box has a volume of 3 x 8 x 15 = 360 cubic inches.
Therefore, the additional cubic inches of cereal that fit in the family-sized box is 360 - 132 = 228 cubic inches.
C. To determine which cereal costs less per cubic inch of cereal, we need to divide the cost of each box by its respective volume.
The regular-sized box costs $3.99 for 132 cubic inches of cereal, which gives us a cost of $0.03 per cubic inch.
The family-sized box costs $5.69 for 360 cubic inches of cereal, which gives us a cost of $0.02 per cubic inch.
Therefore, the family-sized box costs less per cubic inch of cereal.
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a hybrid vehicle has a mileage rating of 22 km/l. what is the gas mileage in miles per gallon? (given: 1 mi
To convert kilometers per liter to miles per gallon, we need to use conversion factors. There are approximately 3.785 liters in a gallon, and there are approximately 1.609 kilometers in a mile.
So, first we convert the fuel efficiency of the hybrid vehicle from kilometers per liter to kilometers per gallon:
1 km/liter * 3.785 liters/gallon = 3.785 km/gallon
Then, we convert kilometers per gallon to miles per gallon:
3.785 km/gallon * 1 mile/1.609 km = 2.35 miles/gallon
Therefore, the gas mileage of the hybrid vehicle is approximately 2.35 miles per gallon.
It's worth noting that the mileage rating of a hybrid vehicle can vary depending on factors such as driving conditions and habits, so the actual gas mileage may differ from the stated rating. Additionally, the conversion factors used here are approximate, so the exact gas mileage may vary slightly depending on the specific conversion factors used.
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Which of the following relations represent functions? Select all that
apply.
A. y=4x-19
D. (-15, 10).(-15, 5),(-10, 0).(-10,-5).(-5, -10)
The only option that represetns a function is the linear equation:
y = 4x - 19
Which of the given relations represent functions?A function is a relation that maps elements from one set, the domain, into elements of another set, the range.
Such that a relation is only a function if each element of the domain is mapped into a single value from the range.
For example, if you look at the second option, here we have the relation:
(-15, 10).(-15, 5),(-10, 0).(-10,-5).(-5, -10)
You can see that the input x = -15 is mapped into two different values, y = 10 and y = 5, so this is not a function.
In the other hand, the first option:
y = 4x - 19
Is a function, this is a linear equation, and each value of x gives a different value of y.
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If ΔDEF is similar to ΔPRY, what is the measure of PY?
A 12 centimeters
B 21 centimeters
C 24 centimeters
D 48 centimeters
2. for each of the following variables, tell me level of measurement and what statistic you would use to quantify central tendency and variability. a. body weight in pounds b. number of cigarettes smoked in a day c. ethnicity d. birth order (i.e., first born, second born, etc.)
In the following question, among the conditions given, the option- a,b and c stand the same ie- The level of measurement is a ratio. The statistic used for the central tendency is the mean or median, whereas d. birth, "is ordinal."
1. Body weight in pounds: The level of measurement is a ratio. The statistic used for the central tendency is mean or median, while for variability, standard deviation or variance can be used.
2. Number of cigarettes smoked in a day: The level of measurement is a ratio. The statistic used for the central tendency is mean or median, while for variability, standard deviation or variance can be used.
3. Ethnicity: The level of measurement is nominal. The statistic used for the central tendency is the mode, while for variability, there is no appropriate statistic.
4. Birth order: The level of measurement is ordinal. The statistic used for the central tendency is median or mode, while for variability, range or interquartile range can be used.
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answer two questions about the following rational division.
1. The quotient in lowest terms of the given rational division is (x+2)/(3x-9).
2. The values of r is A. x=-2 and B. x=0.
What is factor?Factor is a quantity which when multiplied by another quantity, produces a given product. Factors are used to simplify and solve equations, as well as in other areas of mathematics. Factors can be numbers, variables, and expressions.
To find the lowest terms, we must divide the numerator and denominator by the same number. The largest common factor of the numerator and denominator is 3. Dividing both the numerator and denominator by 3, we get (x+2)/(3x-9) = (x+2)/(x-3).
The values of r that must be excluded from the domains of the expressions are x=0 and x=3. x=0 must be excluded because it will create a zero in the denominator which is not allowed. x=3 must also be excluded because it will create a zero in the numerator, and thus make the entire expression equal to 0. Thus, the correct answer is A. x=-2 and B. x=0.
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A refrigerator magnet uses 5/8 inch of magnetic tape. How many refrigerator magnets can you make with 9 3/8 inches of magnetic tape? Explain.
Answer:
To find how many refrigerator magnets can be made with 9 3/8 inches of magnetic tape, we need to divide the total length of magnetic tape by the length of magnetic tape used for each magnet.
First, we need to convert the mixed number 9 3/8 to an improper fraction:
9 3/8 = (9 x 8 + 3)/8 = 75/8
Next, we divide 75/8 by 5/8 to find how many magnets can be made:
(75/8) ÷ (5/8) = (75/8) x (8/5) = 15
Therefore, 15 refrigerator magnets can be made with 9 3/8 inches of magnetic tape.
graph
y = -6
4x + y = 2
calculate breakeven w/ hidden costs, and no sponsorship number of tickets needed to break even for a run 315 323 331 ticket receipts needed to break even $7,592 $7,784 $7,977 average number of tickets needed to break even per show 79 65 56 break-even occupancy 88% 72% 62%
As per the given average, the solution of the breakeven w/ hidden costs is 62% higher.
Let's assume that the costs associated with running a 315-ticket run are $7,592. This means that on average, each ticket needs to sell for $24.10 (($7,592/315) = $24.10) to break even.
Similarly, if we consider the other two runs, we can calculate the average number of tickets needed to break even per show as follows:
For the 323-ticket run, the average number of tickets needed to break even per show is 65. (($7,784/323) = $24.10)
For the 331-ticket run, the average number of tickets needed to break even per show is 56. (($7,977/331) = $24.10)
Furthermore, we can calculate the break-even occupancy percentage for each run, which is the percentage of tickets that need to be sold to break even. The break-even occupancy for each run is as follows:
For the 331-ticket run,
=> 56/331 = 0.17 or 17%,
=> 1-0.17 = 0.83 or 83%,
=> 0.83/0.17 = 4.88,
=> 4.88 x 100% = 488%,
=> 488% x 0.62 = 303%,
=> 303%/4.88 = 62%
Hence the break-even occupancy is 62%.
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Given the right triangle in the diagram below, what is the value of x, to the nearest foot
Therefore, the value of x, to the nearest foot, is A. 11 in the right triangle in the diagram below.
What is triangle?A triangle is a two-dimensional geometrical shape with three sides and three angles. It is a polygon with the least number of sides. Triangles are classified based on the length of their sides and the measure of their angles. The three sides of a triangle can be classified as equal, two equal sides, or three unequal sides. Triangles can also be classified based on their angles as acute (all angles less than 90 degrees), right (one angle is equal to 90 degrees), obtuse (one angle greater than 90 degrees), or equiangular (all angles are equal). The interior angles of a triangle always add up to 180 degrees. The longest side of a right triangle is called the hypotenuse, and it is opposite to the right angle. The Pythagorean theorem is used to find the missing side of a right triangle. Triangles are widely used in mathematics, physics, engineering, and other fields. They form the basic building block of more complex geometrical shapes and structures.
Here,
Using trigonometry, we can find that:
tan(40°) = x/14
Multiplying both sides by 14, we get:
x = 14 * tan(40°)
Using a calculator, we get:
x ≈ 11.0
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Complete question:
Given the right triangle in the diagram below. what is the value of x, to the nearest foot?
A. 11
B. 17
c. 18
D. 22
The number of milligrams D(h) in a patient’s bloodstream h hours after the drug is injected is modeled by the following function D (h) =50e^-0.2h
Find the initial amount injected and the amount in the bloodstream after 7 hours. Round your answers to the nearest hundredth as necessary
The initial amount injected was 50 milligrams and after 7 hours, there are approximately 16.08 milligrams of the drug in the patient's bloodstream.
How to calculate initial amount injected and the amount in the bloodstream after 7 hours.The function that models the number of milligrams D(h) in a patient's bloodstream h hours after the drug is injected is:
D(h) = 50e^(-0.2h)
To find the initial amount injected, we can evaluate D(0):
D(0) = 50e^(-0.2*0) = 50e^0 = 50
Therefore, the initial amount injected was 50 milligrams.
To find the amount in the bloodstream after 7 hours, we can evaluate D(7):
D(7) = 50e^(-0.2*7) ≈ 16.08
Therefore, after 7 hours, there are approximately 16.08 milligrams of the drug in the patient's bloodstream.
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PLX SIMPLIFY -2.6+3.9b
Answer: 3.9b−2.6
Step-by-step explanation: Hope this helps
Answer:
1.3b
Step-by-step explanation:
The equation is -2.6+3.9b. A negative number acts like subtraction, so we would subtract 2.6 from 3.9 to get 1.3. The b is still there, and we don't know what it is, so we simplify the equation to 1.3b.
Sorry, this explanation isn't the best. Hope it helped! :)
The following shows a graph of y = x^2+ 5
Can we use this graph to find the solutions of 0 = c^2 + 5? Why or why not?
we can, now if we look at 0 = x² + 5, that's when the parabola y-value is 0, that is, what's "x" when y = 0? well, if we look at the graph, the graph never touches the x-axis, so that means the graph never has any "real roots", only complex ones or imaginary ones. We can tell because the graph never touches the x-axis.
2. Kathy can run 2 miles to the beach in the same amount of time Dennis can ride his bike 10 miles to work. Kathy runs 8 mph slower than Dennis rides his bike. Find their speeds
Kathy's speed is 2 mph and Dennis's speed is 2+8 = 10 mph.
Let's assume that Kathy's speed is "x" mph. Since Dennis rides 8 mph faster than Kathy, his speed is "x+8" mph.
We know that Kathy can run 2 miles to the beach in the same amount of time Dennis can ride his bike 10 miles to work. Therefore, we can use the formula:
time = distance/speed
For Kathy: time = 2 miles / x mph
For Dennis: time = 10 miles / (x+8) mph
Since they both take the same amount of time, we can set these two equations equal to each other:
2 / x = 10 / (x+8)
We can then solve for "x" as follows:
2(x+8) = 10x
2x + 16 = 10x
16 = 8x
x = 2 mph
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solve for x 144/25=x/5
Answer:
Step-by-step explanation:
144/25=x/5
times both sides by 5
144/5=x
simplify
x=144/5 or 28.8
Answer: x= 144/5
Step-by-step explanation:
Cross-Multiply
144/25 = 25x
Swap the sides so you can solve
720 =25x
Divide both sides
25x=720
x=144/5
you need to study the satisfaction of customers of a specific restaurant. you decide to randomly select one customer at each table. this would most closely describe which type of sampling technique?
Systematic sampling is the term used to describe the sampling method portrayed in the scenario.
Systematic sampling is a form of probability sampling technique in which a researcher randomly selects a beginning point before selecting every nth item from the target population. The researcher is choosing one consumer at each table in this case, which can be interpreted as choosing every nth customer, where n is the average number of customers per table.
When the researcher wants to select a sample from a pre-defined list and the target population is broad and diverse, systematic sampling is a beneficial strategy. Because it takes less time and resources to choose the sample, it is also a more effective strategy than simple random sampling.
It is crucial to remember that systematic sampling might induce bias if the process of selection follows a pattern or is regular. For instance, bias could be introduced if the researcher only chooses consumers at tables with even numbers, producing a non-representative sample. To eliminate bias and get a representative sample, it is crucial to ensure that the selection procedure is truly random.
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Polygon D has been dilated to create polygon D′.
Determine the scale factor used to create the image.
Scale factor of 1.6
Scale factor of 1.2
Scale factor of 0.8
Scale factor of 0.6
The scale factor between polygon D and polygon D' is 1.67.
What is dilation transformation?Dilation is a transformation in mathematics that alters a geometric figure's size while preserving its form and proportions. Enlargement or scaling are other names for it. Dilation can be achieved by multiplying each point's coordinates in a figure by a fixed number known as the scale factor. A figure is expanded when the scale factor is more than 1, and it is shrunk when it is between 0 and 1. Calculating ratios of areas or volumes, describing the relationship between like figures, and modelling real-world situations are all examples of how dilation is utilised in many different branches of mathematics, including geometry, algebra, and calculus.
The scale factor is given as:
scale factor = dimension of D' / dimension of D
Substituting the values:
scale factor = (8 / 4.8) = 1.67
Hence, the scale factor between polygon D and polygon D' is 1.67.
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Answer:
A 1.6
Step-by-step explanation:
Divya has $45 to spend on movie tickets. If each movie ticket is $14 and he pays $1 in tax, how much money does Divya have left over?
Answer:$30
Step-by-step explanation:
45-14=31
31-1=30
so the answer is 30
hope this helps
the physician orders lanoxin elixir 0.175 mg po q.am for the patient. the pharmacy sends a bottle labeled: lanoxin elixir 0.05 mg/ml. how many milliliters will the nurse administer to the patient? write your answer as a decimal number.
The nurse should administer 3.5 mL of Lanoxin elixir 0.05 mg/mL to the patient to achieve the desired dose of 0.175 mg.
First, we need to convert the prescribed dose of 0.175 mg to milligrams per milliliter (mg/mL) using the concentration of the Lanoxin elixir, which is 0.05 mg/mL.
To determine how many milliliters of Lanoxin elixir 0.05 mg/mL the nurse should administer to the patient, we need to use a simple formula:
Dose = Desired dose / Stock strength
Where:
Desired dose is 0.175 mg
Stock strength is 0.05 mg/mL
So, substituting the values into the formula:
Dose = 0.175 mg / 0.05 mg/mL
Dose = 3.5 mL
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this one, i suck at the hypotenuse and i learned it yesterday and this is due today please help break it down for me
The right triangle has a 90-inch perimeter.
Which triangle is on the right?A right triangle is one with a 90 degree inner angle. Its longest side is the hypotenuse, which is also the side of the right triangle that faces the right angle. The two arms of a right angle are made up of height and base.
To get the length of the other right triangle leg, let's apply the Pythagorean theorem: a2 + b2 = c2, where c is the hypotenuse and a and b are the triangle's legs.
We are aware that c = 41 inches and, let's say, a = 40 inches for one of the legs. Hence, we may find b:
40² + b² = 41²
1600 + b² = 1681
b² = 1681 - 1600
b² = 81
b = √81
b = 9
Hence, the other leg is 9 inches long.
We can now determine the triangle's perimeter:
Perimeter = a + b + c
Perimeter = 40 + 9 + 41
Perimeter = 90 inches
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a 13 foot ladder is leaning against a wall. if the top slips down the wall at a rate of 1.25 ft/s, how fast will the bottom of the ladder be moving away from the wall when the top is 12 feet above the ground?
The top of the ladder is 12 feet above the ground, the bottom of the ladder will be moving away from the wall at a rate of 0.096 ft/s.
The question is: a 13 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 1.25 ft/s, how fast will the bottom of the ladder be moving away from the wall when the top is 12 feet above the ground?
To answer this question, we can use the concept of right triangle geometry. We know that when the top of the ladder is 12 feet above the ground, the bottom of the ladder is 13 feet away from the wall.
We can use the Pythagorean Theorem to calculate the hypotenuse of this right triangle, which is the total length of the ladder. This will allow us to calculate the rate at which the bottom of the ladder is moving away from the wall.
The Pythagorean Theorem states that
a^2 + b^2 = c^2,
where a and b are the lengths of the legs of a right triangle, and c is the length of the hypotenuse.
In this case, a is 12 and b is 13.
Therefore,
122 + 132 = c^2, or c^2 = 169.
Therefore, c = 13.04 feet.
This is the total length of the ladder.
We now have the total length of the ladder, so we can calculate the rate at which the bottom is moving away from the wall.
Since we know the top is moving at a rate of 1.25 ft/s, and the total length of the ladder is 13.04 feet, the bottom must be moving at a rate of (1.25/13.04) = 0.096 ft/s.
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A pavement 4m wide is constructed along the outer side of the boundary of a square shaped ground having it's side of 13m length. Find the cost of levelling the pavement at the rate of RS 1. 25 per square meter
A pavement 4m wide is constructed along the outer side of the boundary of a square shaped ground having it's side of 13m length. The cost of levelling the pavement at the rate of Rs 1.25 per square meter is Rs 340.
As per given information,
Side of a square shaped ground = 13 m
Width of pavement constructed = 4 m
We need to find the cost of levelling the pavement at the rate of Rs 1.25 per square meter.
Area of the square shaped ground = Side × Side= 13 × 13= 169 sq.m
Area of the square shaped ground along with pavement constructed
= (13 + 8) × (13 + 8)
= 21 × 21
= 441 sq.m
Area of the pavement constructed
= Area of the square-shaped ground along with pavement constructed - Area of the square shaped ground
= 441 - 169
= 272 sq.m
Cost of levelling 1 sq.m of pavement = Rs 1.25
Cost of levelling 272 sq.m of pavement = 272 × Rs 1.25 = Rs 340
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Convert 1.19rads to degree
Answer:
68.2 degrees
Step-by-step explanation:
[tex]1.19\frac{180}{\pi }[/tex]
[tex]68.2[/tex] degrees
Which formula would you use to calculate the total enclosed space of firm’s 3 structure?
To calculate the total enclosed space of a firm's 3 structures, you would need to measure the interior space of each structure and then add the three values together.
Why it is?
Assuming that each structure is a simple rectangular prism, the formula to calculate the volume (enclosed space) of a rectangular prism is:
Volume = Length x Width x Height
Therefore, to calculate the total enclosed space of the three structures, you would use the following formula:
Total Enclosed Space = Volume of Structure 1 + Volume of Structure 2 + Volume of Structure 3
where the volume of each structure would be calculated using the formula:
Volume of Structure = Length x Width x Height
Make sure to use the same unit of measurement for all three dimensions (length, width, and height) for each structure to ensure accurate calculations.
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Complete Question:
What formula would you use to calculate the total enclosed space of a firm's three structures? Please provide the necessary information such as the dimensions or measurements of each structure and the units used, if available, to accurately calculate the total enclosed space.
If two sets of numbers have the same mean, which of the following must always be true: A) The two sets must have the same variance B) The two sets of numbers must have the same standard deviation. C) The two sets of numbers must be identical. D) None of these statements must be true
None of these statements must be true
=========================================
Explanation:
Let's go through the answer choices one at a time.
----------------
A)
Consider the set {4,5,6}. It has a mean of (4+5+6)/3 = 15/3 = 5. We add up the values and then divide by the number of values (3 in this case).
Now consider the set {3,5,7}. I've added 1 to the largest element and subtracted 1 from the smallest. This will spread the data set out further. The mean is still 5 because (3+5+7)/3 = 15/3 = 5. The center hasn't changed. But the data is more spread out so the variance is larger for this new set.
Therefore, the sets {4,5,6} and {3,5,7} do NOT have the same variance. We cross choice A off the list.
----------------
B)
Recall that
[tex]\text{standard deviation} = \sqrt{\text{variance}[/tex]
For example, if the variance is 36 then the standard deviation would be [tex]\sqrt{36} = 6[/tex]
Because of the connection of the standard deviation and variance, both measure how spread out a set is. Furthermore, it means the sets {4,5,6} and {3,5,7} do NOT have the same standard deviation. We can cross choice B off the list.
----------------
C)
This statement is clearly not true because the sets {4,5,6} and {3,5,7} are not the same, but they produce the same mean. We can cross choice C off the list.
Choice D is the only thing left so it must be the final answer.