The mean hours of sleep that students get per night is 7 hours, the standard deviation of hours of sleep is 1.7 hours, and the distribution is approximately normal. Complete the following sentence. For about 95% of students, nightly amount of sleep is between ______.
A) 5.3 and 8.7 hrs
B) 5 and 9 hrs
C) 3.6 and 10.4 hrs
D) 1.9 and 12.1 hrs

Question

Quizplus · Accepted Answer

For a normal distribution, about 95% of the data falls within two standard deviations from the mean. Calculating this: 7 ± (2 * 1.7) gives the range 3.6 to 10.4 hours.

The Mean Hours of Sleep That Students Get Per Night