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A manufacturer of a computer chip has found that 10% of the chips that come out of production are defective. Assume that the number of

A manufacturer of a computer chip has found that 10% of the chips that come out of production are defective.Assume that the number of defective computer chips satisfy the conditions of a binomial experiment.

a) In a random sample of 500 chips, what is the expected number of defective chips?

b) Find the probability that at least 55 are defective.

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