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The distribution of the number of hours of sleep people get per night is unimodal
and symmetric with a mean of 6 hours and a standard deviation of 1.5 hours.
-If Amanda slept 9.2 hours last night, would you consider this unusual?
A)No, 9.2 hours is less than 2 standard deviations above the mean.
B)No, 9.2 hours is less than 3 standard deviations above the mean.
C)Yes, 9.2 hours is more than 2 standard deviations above the mean.
D)Yes, 9.2 hours is more than 3 standard deviations above the mean.

Question

Quizplus · Accepted Answer

9.2 hours is 2.13 standard deviations above the mean (calculated as (9.2 - 6) / 1.5), which is more than 2 standard deviations, making it unusual.

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