Question: Let X be a random variable with the following probability distribution : Value x of X P (X=x) -30 0.05 -20 0.55 -10 0.25 0

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

Value x of X P (X=x)

-30 0.05

-20 0.55

-10 0.25

00.10

100.05

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

  1. E (x) =____________
  2. Var (X) = ____________

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