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Suppose that each call a student makes to his or her significant other, has an average length of 12 minutes, and a standard deviation of

Suppose that each call a student makes to his or her significant other, has an average length of 12 minutes, and a standard deviation of 3 minutes. Estimate the probability that he or she completely uses up a 300 minutes calling card while talking during 24 conversations.

Do i need to find P(x>=300)???? or P(x=300)?

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