The typical amount of sleep per night for college students has a bell-shaped dis
ID: 3126636 • Letter: T
Question
The typical amount of sleep per night for college students has a bell-shaped distribution with a mean of 7.2 hours and a standard deviation equal to 1.9 hours. Use the Empirical Rule to complete each sentence. (a) About 68% of college students typically sleep between a_1 and b_1 hours per night. a_1 = b_1 = (b) About 95% of college students typically sleep between a_2 and b_2 hours per night. a2 = b2 = (c) About 99.7% of college students typically sleep between a_3 and b_3 hours per night. a_3 = b_3 =Explanation / Answer
68% of all scores in a normally-distributed set of data will fall within ±1 SD of the mean; 95% of all scores will fall within ±2 SD, and 99.7% of all scores within ±3 SD
a1=5.3
b1=9.1
a2=3.4
b2=11
a3=1.5
b3=12.9
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