Question: Computer chips often contain surface imperfections. For a certain type of computer chip, the probability mass function of the number of defects X is presented

Computer chips often contain surface imperfections.

For a certain type of computer chip, the probability mass function of the number of defects X is presented in the following table.

x 01 2 3 4 p(x) 0.4 0.3 0.15 0.10 0.05

a. Find P(X ≤ 2).

b. Find P(X > 1).

c. Find ????X.

d. Find ????2 X.

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