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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