Question: Let X be a random variable with the following probability distribution: Value x of X. P(X=x) -30 0.15 -20 0.15 -10 0.45 0 0.25 Find

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

Value x of X. P(X=x)

-30 0.15

-20 0.15

-10 0.45

0 0.25

Find the expectation E(X) and variance Var(X) of X.

E(x)=

Var(X)=

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