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[See] In January 2010, the American worker spent an average of 75 hours logged on to the Internet while at work. Assume the times are normally distributed

Question: In January 2010, the American worker spent an average of 75 hours logged on to the Internet while at work. Assume the times are normally distributed and that the standard deviation is 20 hours. A person is classified as a ‘heavy user’ if he or she is in the upper 20% of usage. How many hours must a worker have logged on to the Internet to be considered a heavy user?

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[See] In January 2010, the American worker spent an average of 75 hours logged on to the Internet while at work. Assume the times are normally distributed

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