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Suppose 100 interviews are to be conducted. When the interview time per person is X minutes, the mean of the random variable X is 1

Suppose 100 interviews are to be conducted. When the interview time per person is X minutes, the mean of the random variable X is 1 minute and the variance is 0.64. The interview time for each person is a random variable independent of each other. Find the mean and variance of the time T until all the interviews are completed.

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