Rock noise in an underground mine occurs at an average rate, Ask an Expert

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Rock noise in an underground mine occurs at an average rate of three per hour.

(a) Find the probability that rock noise will be recorded for at least 30 minutes.

(b) Suppose that no rock noise has been heard for 15 minutes. Find the probability that another 30 minutes will elapse before the first rock noise is detected.

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Statistics and Probability, Statistics

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