Question: Suppose that each call a student makes to his girlfriend has an average length of 12 minutes, and the standard deviation of the length of

Suppose that each call a student makes to his girlfriend has an average length of 12 minutes, and the standard deviation of the length of each call is also 3 minutes. Estimate the probability that he completely uses up a 300-minute calling card while talking to his girlfriend during 24 conversations.

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