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 p(x) 0 0.4 1 0.3 2 0.15 3 0.10 4 0.05

a. Find $P(X \leq 2)$.

b. Find $P(X>1)$.

c. Find $\mu_{X}$.

d. Find $\sigma_{x}^{2}$.

X p(x) 0 0.4 1 0.3 2 0.15 3 0.10 4 0.05

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