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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 62.06

The amount of time spouses shop for anniversary cards can be modeled by an exponential distribution with the average amount of time equal to 62.06 minutes. Let X - is the amount of time (in minutes) that a randomly selected spouse spends to shop for anniversary card. What is the standard deviation of X?

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