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Suppose that the distribution of the amount of time per day that individuals spend surfing the internet is normal with a mean of 240 minutes

Suppose that the distribution of the amount of time per day that individuals spend surfing the internet is normal with a mean of 240 minutes and a standard deviation of 40 minutes. Psychologists say that a person who spends more than 6 hours a day on the internet may have an addiction to their computer! What percentage of the population has this problem?

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