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According to Nielsen ratings, more than 73.1 million people watched the first 90-minute presidential debate on television on Tuesday night. The average person watched 49

According to Nielsen ratings, more than 73.1 million people watched the first 90-minute presidential debate on television on Tuesday night. The average person watched 49 minutes of the debate. Let's suppose the viewing time has a standard deviation of 15 minutes. If the viewing time (in minutes) is normally distributed, what is the probability, if we pick a random viewer, that his or her viewing time will be between 64 and 74 minutes?

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