Computer chips often contain surface imperfections. For a certain type of computer chip, the probability mass function

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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.

3 0.4 0.3 0.15 0.10 0.05 P(x)

a. Find P(X ‰¤ 2).

b. Find P(X > 1).

c. Find μX.

d. Find σ2X.

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