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6.1 question 18 How much do you study? A survey among freshmen at a certain university...

6.1 question 18

How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 27 and standard deviation 7. Use the TI-84 PLUS calculator to answer the following. Round the answer to at least four decimal places.

(a) What proportion of students studied more than 38 hours?

(b) What is the probability that a randomly selected student spent between 15 and 31 hours studying?

(c) What proportion of students studied less than 31 hours?

Math   Statistics-And-Probability   
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