1. Assume that the time the student stays in school is normally distributed with a mean of 5 hours and a standard deviation of 0.5 hours. Everyday, lan stays in school for 5.5 hours. What proportion of students stays less than 5.5 hours? 2. Scores of an achievement test show that it fallows a normal distribution. Its mean is 78 with standard deviation of 8. Find the interval wherein the middle 80% of the scores lie

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