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On average, a pair of running shoes are advertised to last 10 months if used every day. Assume the advertised claim is true and that

On average, a pair of running shoes are advertised to last 10 months if used every day. Assume the advertised claim is true and that the length of time running shoes last is exponentially distributed. (a) What is the probability a pair of these running shoes last within 7 months of the advertised average? (b) What percentage of these running shoes last within 8 months of the advertised average? % Round all answers to four decimal places

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