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 0 1 234 p(x) 0.4 0.3 0.15 0.10 0.05

a. Find P(X ≤ 2).

b. Find P(X > 1).

c. Find µX .

d. Find σ2 X .

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