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Mean Variance Probability: The Duration of a Phone Call

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** Please see attached file for the complete problem description **

The duration T of a certain type of phone call is found to satisfy
(please see the attached file)
where (please see the attached file). Find the mean and variance of T. If two independent calls are made, what is the probability that their combined duration is more than t?

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This solution provides a step-by-step explanation of how to determine the mean variance of the given problem.

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