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3 years ago

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Mathematics

1 answer:

Ira Lisetskai [31]3 years ago

8 0

Answer:

its (B) 80

Step-by-step explanation:

i got it right

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(b) Develop a probability distribution for x y. x y f(x y) 130 Incorrect: Your answer is incorrect. 80 Incorrect: Your answer is

GenaCL600 [577]

Answer:

P(X = x, Y = y) = f(x, y)

Step-by-step explanation:

Let X be a discrete random variable, and suppose that the possible values that it can assume are given by x1, x2, x3, . . . , arranged in some order. Suppose also that these values are assumed with probabilities given by

P(X = xk) = f(xk) k = 1, 2, . . . (1)

It is convenient to introduce the probability function, also referred to as probability distribution, given by

P(X = x) = f(x)

If X and Y are two discrete random variables, we define the joint probability function

of X and Y by

P(X = x, Y = y) = f(x, y)

where f(x, y) ≥ 0

5 0

3 years ago

Solve for q.

Anni [7]

Answer:

q=9 q=2

Step-by-step explanation:

(q − 9)(q − 2) = 0

Using the zero product property

q-9 = 0 q-2=0

Solving each equation

q=9 q=2

7 0

3 years ago

Find y when x=14 if y varies directly with x exponent 2, and y=72 when x =6

34kurt

It is times 12 since 6 times 12 is 72 then 14 times 12 is 168. So y=168

3 0

3 years ago

A rancher plans to make 4 identical and adjacent rectangular pens against a barn (see figure below), each with an area of 100 m^

Tasya [4]

Answer:

10 by 10 meters

Step-by-step explanation:

In calculus terms, you can use the formula for the perimeter which is 2l + 2w, and the area l × w.

Then since the area is 100

l × w = 100. So w = 100/l

Then substitute this into the perimeter formula.

w = 100/l → 2l + 2(w) = 2l + 2(100/l) = 2l + 200/l.

Then take the derivative d/dx [take the derivative of a quantity with respect to x], by using a simpler method known as the power rule:

d/dx[x^n] = nx^n-1

so p = 2l + 200/l becomes p' = 2 - 200/l^2

Since the derivative of a constant is 0, to solve for l, set p' to 0

0 = 2 - 200/l^2 → -200/l^2 = -2 → 200/l^2 = 2 → 2l^2 = 200 → l^2 = 100 → l = √100, l = 10.

Now that we know the length is 10, We can substitute the length in the original equation to find the width.

l = 10 → w = 100/l → w = 100/10, w = 10.

Therefore the perimeter of each rectangular pen is 40, with a length of 10 and width of 10.

If you want to do this algebraicly, there are more steps involved

7 0

3 years ago

Solve the inequality.

Dovator [93]

The option c) x < -24 represents the solution set of the given inequality.

<u>Step-by-step explanation</u>:

The given inequality is −1/4x−12 > −6

<u>To find the solution set :</u>

Keep the x term on one side and constants on other side of the inequality.

-1/4x > -6+12

-1/4x > 6

-x > (6 $\times$ 4)

-x > 24

Multiply both sides with -1 to remove the negative sign of x.

While multiplying or dividing a negative number in an equality, the inequality sign must be flipped.

⇒ x < -24

5 0

4 years ago