The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution with the average amount of time equal to 81.70 minutes. Let X - is the amount of time (in minutes) that a randomly selected spouse spends shopping for an anniversary card. What is the standard deviation of X?

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The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution with the average amount of time equal to 81.70 minutes. Let X - is the amount of time (in minutes) that a randomly selected spouse spends shopping for an anniversary card. What is the standard deviation of X?

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