Question: Let X be a random variable with the following probability distribution: Value x of X P (X=x) 40 0.10 50 0.50 60 0.10 70 0.30

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

Value x of X P (X=x)

40 0.10

50 0.50

60 0.10

70 0.30

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

E (x) =

Var (X)=

.

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