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The instructions suggest using Excel, but I'm not sure how to do that.... Researchers believe the amount of time a typical teenager spends watching TV

The instructions suggest using Excel, but I'm not sure how to do that....

Researchers believe the amount of time a typical teenager spends watching TV every day is normally distributed, with a mean of 5 hours and 20 minutes and a standard deviation of 1 hour and 15 minutes.

What is the probability that a randomly selected teenager watches less than 3 hours of TV per day?

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