At the bookstore where you are working, the number of minutes until the next sale of the

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At the bookstore where you are working, the number of minutes until the next sale of the book Home Engineering is exponentially distributed with parameter \(\lambda=\frac{1}{15}\).

(a) What is expected time until the next sale of Home Engineering?

(b) What is the probability that the next sale happens in between 5 and 20 minutes?

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