Question: Let T be a continuous random variable representing the amount of time (in minutes) a postal clerk spends with her customer. The time is known

Let T be a continuous random variable representing the amount of time (in minutes) a postal clerk spends with her customer. The time is known to have an exponential distribution with the average amount of time equal to = 4 minutes i.e. the exponential decay parameter is m = 1/ = 1/4. The corresponding probability density function is described by

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