Question: 9. The time that it takes for a calculus student to answer all the questions on a certain exam is an exponential random variable with

9. The time that it takes for a calculus student to answer all the questions on a certain exam is an exponential random variable with mean 1 hour and 15 minutes. If all 10 students of a calculus class are taking that exam, what is the probability that at least one of them completes it in less than one hour?

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