Question: (a) Use a computer program to calculate the probability that more than 12 of 80 business telephone calls last longer than five minutes if it

(a) Use a computer program to calculate the probability that more than 12 of 80 business telephone calls last longer than five minutes if it is assumed that 10 percent of such calls last that long.
(b) Can this result be used as evidence that the assumption is reasonable? Why?

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