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www-awa.aleks.com ?? Learn Sorry, this p... Learn - ??????? Attention P ????? ???????... K Redirect Random Variables and Distributions Expectation and variance of a random variable 0/5 ???? Español Let \( X \) be a random variable with the following probability distribution. \begin{tabular}{|c|c|} \hline Value \( x \) of \( X \) & \( P(X=x) \) \\ \hline-30 & 0.10 \\ \hline-20 & 0.15 \\ \hline-10 & 0.20 \\ \hline 0 & 0.30 \\ \hline 10 & 0.25 \\ \hline \end{tabular} Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation \( E(X) \) of \( X \). \[ E(X)=\square \] (b) Find the variance \( \operatorname{Var}(X) \) of \( X \). \[ \operatorname{Var}(X)=\square \] Explanation Check

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Random Variables and Distributions
Expectation and variance of a random variable
0/5
????
Español

Let \( X \) be a random variable with the following probability distribution.
\begin{tabular}{|c|c|}
\hline Value \( x \) of \( X \) & \( P(X=x) \) \\
\hline-30 & 0.10 \\
\hline-20 & 0.15 \\
\hline-10 & 0.20 \\
\hline 0 & 0.30 \\
\hline 10 & 0.25 \\
\hline
\end{tabular}

Complete the following. (If necessary, consult a list of formulas.)
(a) Find the expectation \( E(X) \) of \( X \).
\[
E(X)=\square
\]
(b) Find the variance \( \operatorname{Var}(X) \) of \( X \).
\[
\operatorname{Var}(X)=\square
\]
Explanation
Check

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Random Variables and Distributions
Expectation and variance of a random variable
0/5
????
Español

Let X be a random variable with the following probability distribution.

Value x of X P(X=x)

-30 0.10

-20 0.15

-10 0.20

0 0.30

10 0.25

Complete the following. (If necessary, consult a list of formulas.)
(a) Find the expectation E(X) of X.

E(X)=□

(b) Find the variance Var(X) of X.

Var(X)=□

Explanation
Check

Added by Darnell C.

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