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Write an expression for the exact probability

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Suppose that 50% of all watches produced by a certain factory are defective (the other 50% are fine). A store buys a box with 400 watches produced by this factory. Assume this is a random sample from the factory.

(a) Write an expression for the exact probability that at least 215 of the 400 watches are defective.

(b) Approximate the probability, using either the Poisson or normal approximation, whichever is appropriate, that at least 215 of the 400 watches are defective.

Reference no: EM131929551

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