30-04-2024
Mathematics

Answered

There are 120 students at Francis Howell North High School. The amount of sleep all 120 students at Francis Howell North High School take at a night follows an approximately normal distribution with mean of and the standard deviation of . Mr. Willott conducts a poll that asks 20 randomly selected students how many hours of sleep they got last night. The poll shows the average amount of sleep hours is 7.5 hours.

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