Samples of 20 rivets for a steel structure are checked for quality every hour.the probability of finding a bad rivet that has to be scrapped is 1%.assume that x is the number of parts in the sample of 20 that have to be scrapped.what is the probability that x exceeds its mean by three standard deviations?what is the probability that x exceeds 1 in at least one of the next five hours of quality checks?
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