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3 years ago

!!!!!!!!!!!!!!!!!!!!!

Mathematics

2 answers:

S_A_V [24]3 years ago

8 0

Answer:

Step-by-step explanation:

Delicious77 [7]3 years ago

4 0

Answer:

Im gona guess C but im not 100%

Step-by-step explanation:

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Let

Digiron [165]

What I gather from the question is that $X$ has second moment $E(X^2)=81$ and variance $V(X) = 58$ , and you're asked to find the expectation and variance of the random variable $Y=2X+10$ .

From the given second moment and variance, we find the expectation of $X$ :

$V(X) = E(X^2) - E(X)^2 \implies E(X) = \sqrt{E(X^2) - V(X)} = \sqrt{23}$

Expectation is linear, so

$E(Y) = E(2X+10) = 2 E(X) + 10 = \boxed{2\sqrt{23} + 10}$

Using the same variance identity, we have

$V(Y) = V(2X+10) = E((2X+10)^2) - E(2X+10)^2$

and

$E((2X+10)^2) = E(4X^2 + 40X + 100) = 4E(X^2) + 40E(X) + 100 = 424 + 40\sqrt{23}$

so that

$V(Y) = V(2X+10) = (424 + 40\sqrt{23}) - (2\sqrt{23} + 10)^2 = \boxed{232}$

Alternatively, we can use the identity

$V(aX+b) = a^2 V(X) \implies V(2X+10) = 4V(X) = 232$

5 0

2 years ago

Find the value of x for the right triangle.

Akimi4 [234]

Answer:

tan teeta = opposite

adjacent

45°= 7

multiply both sides by x

which will now give us

45°x=7

45°. 45°

x= 0.16

hope it helps

4 0

2 years ago

How many solutions does the system of equations have?

34kurt

Answer:

No i will not

Step-by-step explanation:

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3 0

3 years ago

What is the corrct answer

Mademuasel [1]

D is the right answer

4 0

3 years ago

45% of what distance is 135 miles

horrorfan [7]

300 miles. Hope it helps

8 0

3 years ago

Read 2 more answers