Question

8. The distribution of hours of sleep per week night, among college students, is found to...

8. The distribution of hours of sleep per week night, among college students, is found to be Normally distributed, with a mean of 6.5 hours and a standard deviation of 1 hour.

1). 3pts. What proportion of the students have sleep hours more than 8 hours? Show your work

2). 4pts. What proportion of the college students have sleep hours between 5 and 7 hours? Show your work.

3). 3pts. What is the probability that a student has exactly 6.5 sleep hours.

4). 4pts. What sleep hour does a student have to be in an upper 5%? Show your work.

4). 4pts. What is the lower quartile of the sleep hours for college students? Show your work.

Math   Statistics-And-Probability   
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