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The time it takes to completely tune an engine of an automobile follows an exponential distribution with a mean of 30 minutes. (Round your

The time it takes to completely tune an engine of an automobile follows an exponential distribution with a mean of 30 minutes. (Round your answers to four decimal places.) (a) What is the probability of tuning an engine in 20 minutes or less? (b) What is the probability of tuning an engine between 20 and 25 minutes?

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