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.

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

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

c. Find \(\mu_{X}\).

d. Find \(\sigma_{x}^{2}\).

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