Question
6. (4 pts) The average number of hours of sleep that US college students get is...
6.
(4 pts) The average number of hours of sleep that US college
students get is known to be Normally distributed, with μ = 7.02
hours and σ = 1.15 hours. (6.1) What proportion of students get
less than 5 hours of sleep per night on the average? (1 pt) (6.2)
Sam gets an average of 8.3 hours of sleep. What is Sam’s percentile
score (z-statistics)? (2 pts) What is Sam’s percentile raking (the
percentage of students whose hours of sleep are less than or equal
to Sam’s)? (1 pt) （calculate step by step ）
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