Let X be a random variable with the following probability distribution. Value x of X P(X=x) no 10 0.25

Question

Let X be a random variable with the following probability distribution.
Value x of X P(X=x)    no
      10                 0.25
      20                 0.05
      30                 0.25
      40                 0.30 
      50                 0.15
Complete the following. (If necessary, consult a list of formulas.)
(a) Find the expectation E (X) of X.
                E(X) = 30.5
(b) Find the variance Var(x) of X. 
              Var(X) = 195

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