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Consider the probability mass function of a discrete random variable X in the table below: x 1 2 3 4 p(x) 0.09 .22 .44 ?

Consider the probability mass function of a discrete random variable X in the table below:

x 1 2 3 4

p(x) 0.09 .22 .44 ?

(a) What is p(4), the missing value in the table above?

(b) What is E(X), the expected value of X?

(c) What is V (X), the variance of X?

(d) What is the probability that X is at most 2?

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