a section of an exam contains four true false questions. A completed exam paper is selected at random, and four answers are recorded.
the probability that all answers are False?
the probability that exactly three or four answers is false?
the probability that at lastt answer is true is ?

Answer: To find the expected value of X, we need to multiply each possible value of X by its probability and then add up the results:

E(X) = Σ(x * P(X = x))

where Σ denotes the sum over all possible values of X.

Using the table given, we have:

E(X) = 0 * 0.09 + 1 * 0.29 + 2 * 0.42 + 3 * 0.15 + 4 * 0.05

E(X) = 0 + 0.29 + 0.84 + 0.45 + 0.2

E(X) = 1.78

Therefore, the expected value of pets in a randomly selected household is 1.78.

Step-by-step explanation:

Answer:

ok, what do you want me to answer?

Answer:

Step-by-step explanation:

i cant see good

Answer:

I think it would be commutative property

Step-by-step explanation:

the commutative property states that the numbers on which we operate can be moved or swapped from their position without making any difference to the answer. The commutative property only works with addition and multiplication.

Answer: To graph the linear equation x - y = 1, we can find its intercepts by setting one of the variables to zero and solving for the other.

Step-by-step explanation:

Setting x = 0, we get:

0 - y = 1

Solving for y, we get:

y = -1

So the y-intercept is (0, -1).

Setting y = 0, we get:

x - 0 = 1

Solving for x, we get:

x = 1

So the x-intercept is (1, 0).

Now we can plot the intercepts on a coordinate plane and draw a straight line passing through them:

    |

    |    .

    |        .

    |             .

    |                  .

    |                        .

    |                             .

------------------------------------------

    |         |         |         |         |

   -2        -1         0         1         2

Therefore, the graph of the linear equation x - y = 1 is a straight line passing through the points (0, -1) and (1, 0).

Step-by-step explanation:

So first of all u going to make sure all the base is the same so it 's easier for u to simplify

and then after that in order to make all the base the same so u need to multiple (x²-4) ...

Answer:

To make the piano player's practice seem consistent, adjust the Y-axis scale, use a line graph, and add a trend line or moving average.

Step-by-step explanation:

To adjust the graph to make it seem like the piano player is pretty consistent in practicing, we can make the following changes:

Adjust the scale of the Y-axis to make the differences in the average practice times appear smaller. For example, we can change the range of the Y-axis from 0-15 to 8-14, since all the data points fall within this range. This would compress the data vertically and make the differences in the average practice times appear smaller.

Use a line graph instead of a bar graph to better show the trend of the data over time. This would allow us to see any patterns or trends in the average practice times over the course of the year.

Add a trend line or moving average to the graph to show the overall trend in the data and smooth out any fluctuations. This would further emphasize the consistency in the piano player's practice habits.

By making these adjustments, the graph would show that the piano player is consistently practicing for around 10-11 hours per week throughout the year, with some slight variations. This would convey the message that the piano player is dedicated and consistent in their practice habits.

Hope this helps! I'm sorry if it's wrong. If you need more help, ask me! :]

The firm should produce good  x₁ = 4 and x₂ = 8 to minimize cost of C = x₁² + x₂² .

What is Lagrange multipliers ?

Lagrange multipliers is a method used in optimization problems to find the maximum or minimum value of a function subject to one or more constraints. The method involves introducing a Lagrange multiplier, which is a scalar variable, to the objective function and the constraint(s). This forms the Lagrangian function, which is then optimized with respect to the original variables and the Lagrange multiplier.

To minimize the cost C = x₁² + x₂²

We can use the method of Lagrange multipliers to solve this problem. Let's define the Lagrangian function L as:

L(x₁, x₂, λ) = x₁²+ x₂² + λ(400 - 5x₁²- 8x₁x₂ - 15x₂²)

Taking partial derivatives of L with respect to x₁, x₂, and λ, we get:

∂L/∂x₁ = 2x₁ - 10λx₁ - 8λx₂ = 0

∂L/∂x₂ = 2x₂ - 30λx₂ - 8λx₁ = 0

∂L/∂λ = 400 - 5x₁² - 8x₁x₂ - 15x₂² = 0

Solving these equations simultaneously, we get:

x₁ = 4

x₂ = 8

λ = 1/20

Hence, the firm should produce a combination of x₁ = 4 and x₂ = 8 to minimize the cost of C = x₁² + x₂² while satisfying the production quota of 400.

To learn more about Lagrange multipliers , visit the link:

https://brainly.com/question/30459783

#SPJ1

The portfolio depicted as a box-and-whisker plot has a random selection of one stock, with probabilities of 0.51, 0.50, and 0.50.

The probability is frequently described as the ratio of favourable results to all favourable results in the sample. The likelihood of an occurrence P(E) = (The number of favorable events) is how it is stated (Sample space).

Probability is just the possibility that something will happen. When we don't know how an event will turn out, we might discuss the likelihood or likelihood of several outcomes. Biostatistics seems to be the analysis of occurrences with a probability distribution.

Given the box plot,

(a)

[tex]P(X < 51) = 0.51[/tex]

(b)

[tex]P(22 < X < 51) = 0.50[/tex]

(c)

[tex]P(X \geq 30) = 0.50[/tex]

To know more about probability visit:

https://brainly.com/question/11234923

#SPJ1

Answer:

[tex]d^{2}[/tex] - 16.

Step-by-step explanation:

To solve for the product of (d + 4) and (d - 4), we can use the FOIL method.

This means we multiply the first terms, then the outer, then the inner, and finally the last terms, then we add all the products together.

So, (d + 4) (d - 4) can be expanded like this:

Adding all of them together, we get: [tex]d^{2}[/tex] - 4d + 4d - 16, which simplifies to [tex]d^{2}[/tex] - 16.

Therefore, (d + 4)(d - 4) = [tex]d^{2}[/tex] - 16.

The ratio for 2 quantities of flour and milk is given as follows:

d. 6:4.

The ratio 2 quantities of flour and milk is obtained applying the proportions in the context of the problem.

A proportion is applied as to obtain the ratio between two amounts, you simply divide one amount by the other. The ratio is expressed as a fraction, and can also be expressed as a decimal or a percentage.

The amounts for a single recipe are given as follows:

Hence for two quantities, the amounts are multiplied by two as follows:

Meaning that the ratio is given as follows:

6:4.

More can be learned about proportions at https://brainly.com/question/24372153

#SPJ1

Answer:

Step-by-step explanation:

Use SAS congruency; AD=DC, and they both share side BD. Also, BD is the perpendicular bisector to AC, so it also forms 2 right angles. Proof using SAS.

Or, if you don’t know SAS congruency, you may use SSS congruency;

Use the Pythagorean theorem. Side length AB^2 = AD^2 + BD^2
BC^2 = DC^2 + BD^2.

AD=DC, so therefore AB = BC. Use SSS congruency, and there you go.

Step-by-step explanation:

f(X)=ax+q

domain: X element of real numbers

The factored version of the provided polynomial is (6x-1) according to the given assertion.(x-3).

An expression that consists of variables, factors, and exponents and is mixed using mathematical operations like addition, subtraction, multiplication, and division is referred to as a polynomial. (No division operation by a variable).

To factor the polynomial x(6x-1)-3(6x-1), we can first simplify the expression by factoring out the common factor of (6x-1):

x(6x-1)-3(6x-1) = (6x-1)(x-3)

Therefore, the factored form of the given polynomial is (6x-1)(x-3).

To know more about Polynomial visit:

https://brainly.com/question/2833285

#SPJ1

Answer:

2500ml

Step-by-step explanation:

1litre=1000millilitres

2.5=?

=2.5×1000

=2500millilitres

After addressing the issue at hand, we can state that We know that when  function x = 0, y = b because the function has the form y = mx + b.

Mathematicians investigate numbers and their varieties, equations and adjacent tissues, shapes but instead their locations, and potential locations for these things. The term "function" refers to the relationship here between set of inputs, each with its own output. A function is a relationship of both inputs and outputs in which each input results in a single, distinct production. Each function has its own domain, codomain, or scope. The letter f is commonly used to denote functions (x). An x represents entry. On functions, each capabilities, so several capabilities, in capabilities, and on operations are the four major types of accessible functions.

We know that the function represented by the table of values has the form y = mx + b because it is linear, where y represents the distance from Nate's starting point and x represents the time he has been travelling.

The rate of change is known to be 50 miles per hour. This means that Nate's distance from his starting point increases by 50 miles for every hour he travels. In other words, m equals 50.

We know that when x = 0, y = b because the function has the form y = mx + b.

To know more about function visit:

https://brainly.com/question/28193995

#SPJ1

In the given diagram, using the tangent theorem, the value of x to the nearest tenth is 16.6

From the question we are to determine the value of x.

From one of the tangent theorems, we have that

The tangent to the circle is perpendicular to the radius of the circle at the point of contact.

Thus, the triangle is a right triangle

From the Pythagorean theorem which states that, in a right triangle, the square of the hypotenuse equals sum of squares of the other two sides.

Then, we can write that

x² = 9² + 14²

x² = 81 + 196

x² = 277

x = √277

x = 16.6433

x ≈ 16.6 (to the nearest tenth)

Hence, the value of x is 16.6

Learn more on Tangent theorem here: https://brainly.com/question/20521999

#SPJ1

Answer:

Rounding to the nearest hundredth of a foot, the change in altitude is approximately 514.77 feet.

Step-by-step explanation:

To solve this problem, we can use trigonometry. The angle of climb is 15 degrees, which means that the ratio of the change in altitude to the horizontal distance traveled is the tangent of 15 degrees:

tan(15°) = change in altitude / horizontal distance

We can rearrange this equation to solve for the change in altitude:

change in altitude = horizontal distance x tan(15°)

Substituting the given values, we get:

change in altitude = 2 miles x tan(15°)

We can convert the distance to feet by multiplying by 5280:

change in altitude = 2 miles x 5280 feet/mile x tan(15°)

Using a calculator, we get:

change in altitude ≈ 514.77 feet

Rounding to the nearest hundredth of a foot, the change in altitude is approximately 514.77 feet.

a. ΔEGF~ΔGHF~ΔEHG are the similarities between the three right triangles.

b. HF/HG = GH/EH; EF/EG = EG/EH

According to the similar right triangle theorem, if a right triangle's altitude is drawn from its right angle, two similar right triangles are created, and both similar right triangles are identical to the original right triangle. All three right triangles are essentially the same.

Similar triangles contain three pairs of comparable side lengths that are proportionate to one another, or whose ratios are identical.

The corresponding side lengths are taken into account when constructing similarity statements.

A similarity assertion linking the three right triangles is thus: ΔEGF~ΔGHF~ΔEHG.

b. They will have the following side ratios: EF/EG = EG/EH HF/HG = GH/EH

To know more about similar right triangles, visit:

https://brainly.com/question/14285697

#SPJ1

The correct option is 312 cm² as the area of the composite figure calculated to be equal to 312 square centimeters.

The composite figure can be observed to be made up of two identical triangle and a rectangle, so we shall calculate for the area of one triangle, multiply the result by 2, and add the area to the area of the rectangle to get the total area of the composite figure as follows:

area of one of the triangle = 1/2 × 12 cm × 10 cm

area of one of the triangle = 6 cm × 10 cm

area of one of the triangle = 60 cm²

area of one of the two triangle = 2 × 60 cm²

area of one of the two triangle = 120 cm²

area of the rectangle = 16 cm × 12 cm

area of the rectangle = 192 cm²

total area of the composite figure = 120 cm² + 192 cm²

total area of the composite figure = 312 cm²

Therefore, the area of the composite figure is equal to 312 square centimeters.

Know more about area here:https://brainly.com/question/21135654

#SPJ1

Heather's account balance will be approximately $1,340.55 after 7 years if the interest is compounded 6 times each year.

To solve this problem, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where:

A is the account balance after a certain amount of time

P is the principal or initial amount invested

r is the annual interest rate (as a decimal)

n is the number of times the interest is compounded per year

t is the time period in years

Given tha data in the question;

First, convert R as a percent to r as a decimal

r = R/100

r = 3.5/100

r = 0.035 rate per year.

Substituting these values into the formula solve for accrued amount, we get:

A = P(1 + r/n)^(nt)

A = 1,050(1 + 0.035/6)^(6 × 7)

A = 1,050(1 + 0.005833333333333)⁴²

A = 1,050(1.005833333333333333)⁴²

A = $1,340.55

Therefore, the accrued amount is $1,340.55.

Learn more about compound interest here: brainly.com/question/27128740

#SPJ1

Therefore , the solution of the given problem of quadratic equation comes out to be x = 2, -3 + √(5)i, -3 - √(5)i.

Regression modelling uses the polynomial answer x = ax2 + b + c=0 for one-variable equations. The First Proposition of Algebra claims that since this proposition has a second order, there can only be one solution. There are simple and complicated solutions available variable . Even as the name suggests, a "non-linear formula" has four factors. According to this, there might be just one squared term. In the formula ax2 + bx + c = 0

Here,

The provided polynomial equation can be rewritten as follows:

=> x³ + 4x² - 7x - 28 = 0

The constant term in this situation is -28, with components of 1, 2, 4, 7, 14, and 28, and a leading coefficient of 1. Therefore, 1, 2, 4, 7, 14, and 28 are among the polynomial's potential rational solutions.

It is possible to factor the polynomial by discovering that x = 2 is one of its roots.

=> (x - 2)(x² + 6x + 14) = 0

The quadratic formula can be used to calculate the quadratic factor:

=> x = (-6 ± √(6² - 4114)) / (2*1)

=> (-6 ± √(-20)) / 2

=>  -3 ± √(5)i

Thus, the following are the answers to the algebraic equation:

=> x = 2, -3 + √(5)i, -3 - √(5)i.

To know more about quadratic equation visit:

https://brainly.com/question/30098550

#SPJ1

There are 252 different ways to assemble the committee.

Permutation:

A simple definition of permutation is the various ways to arrange some or all of the members in a particular order.

It is the process of orderly disorganisation.

A permutation is what is meant by this.

Combination: Combination is the process of choosing one or more objects from a group of objects so that, unlike permutations, the order in which the objects are chosen is irrelevant.

It describes the combination of N items drawn randomly from a collection of K items at a time.

Hence, There are 252 different ways to assemble the committee.

learn more about permutations and combinations click here:

https://brainly.com/question/28065038

#SPJ1

Answer:

approx 20% of the department faculty have 20 or more years of service

Step-by-step explanation:

To find the percentage of the department faculty with 20 or more years of service, we need to add up the number of faculty members in the "20-24.9" and "25 or more" year categories, since anyone with 20 or more years of service would fall into one of these categories.

Looking at the histogram, we see that there are 24 faculty members in the "20-24.9" year category, and an additional 4 in the "25 or more" year category. Therefore, the total number of faculty members with 20 or more years of service is 24 + 4 = 28.

To calculate the percentage of faculty members with 20 or more years of service, we need to divide this number by the total number of faculty members in the department, which we can find by adding up the heights of all the bars in the histogram. Based on the heights of the bars in the histogram, we can estimate that the total number of faculty members is approximately 140.

Therefore, the percentage of faculty members with 20 or more years of service is:

(28/140) x 100% = 20%

So, approximately 20% of the department faculty have 20 or more years of service.

In descending order in terms of y, the expression is -x³y⁵ - 2x²y³ + 4xy + x⁴.

When a pattern of numbers in mathematics has a decreasing value, the numbers are said to be in descending order. It indicates that the numbers are sorted from highest to lowest. Information is considered to be in descending order if it is arranged from highest to lowest. For example 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 are ordered in descending order. In other terms, it is considered to be in descending order if the numbers are listed from greatest to smallest.

The given expression is:

x⁴- x³y⁵+ 4xy - 2x²y³

To arrange in descending order, place the highest value first followed by the smaller value.

Therefore, in decreasing order in terms of y, the expression is -x³y⁵ - 2x²y³ + 4xy + x⁴.

Learn more about descending order here:

https://brainly.com/question/23938305

#SPJ1

Answer:

18.4

Step-by-step explanation:

ur welcome

The percentage of bicyclists that finished the race in less than 56 minutes is 96 %

Percentage is a ratio out of hundred

If in a​ race, 24 out of the 25 bicyclists finished in less than 56 minutes. To find what percent of bicyclists finished the race in less than 56 ​minutes, we first write it in a fraction as number/total

Since

We have that

fraction = number/total

= 24/25

Now to write it as a percentage, we multiply by 100.

So, we have that percentage = fraction × 100 %

So, we have that in percentage = 24/25 × 100 %

= 24 × 4 %

= 96 %

So, the percentage is 96 %

Learn more about percentage here:

https://brainly.com/question/24339661

#SPJ1

Answer: a. To find the earnings per share (EPS), we can use the formula:

P/E ratio = Price per share / Earnings per share

Rearranging this formula to solve for EPS, we get:

Earnings per share = Price per share / P/E ratio

Substituting the given values, we have:

Earnings per share = $53.21/13.26 ≈ $4.01

Therefore, the earnings per share were approximately $4.01.

b. To determine if the stock is overpriced, underpriced, or about right given the historical P/E ratio of 12-14, we can compare the current P/E ratio to this range. Since the current P/E ratio is 13.26, which falls within the historical range, the stock seems to be about right in terms of valuation. However, it's important to note that other factors should also be considered before making any investment decisions.

Step-by-step explanation:

Answer:

3 races

Step-by-step explanation:

(Let t = total number of races)

Each race costs $3.50, so the total cost of racing t times is 3.50 × t or 350t. Douglas wants to have at least $7.75 left on his card, so an inequality to represent this would look like this:

Solving this inequality, we get:

Or we can do this.

Therefore, Douglas can race the go-karts 3 times and still have at least $7.75 left on his card to play arcade games.