Question: Let X be a random variable with the following probability distribution: Value x of X P(X=x) 3 0.15 4 0.25 5 0.20 6 0.15 7

LetXbe a random variable with the following probability distribution:

ValuexofX P(X=x)

3 0.15

4 0.25

5 0.20

6 0.15

7 0.25

Find the expectationE(X) and variance Var (X) of X.

E(x) = ?

Var(x) = ?

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