Use the following statement to answer the questions below.
-The distribution of waiting times at the student health center is bell-shaped with a mean of 13 minutes and a standard deviation of 2. Give an interval that is likely to contain about 95% of wait times.
A) 9 to 17 minutes
B) 11 to 15 minutes
C) 7 to 19 minutes
D) 9 to 13 minutes

Question

Quizplus · Accepted Answer

According to the empirical rule (68-95-99.7 rule) for a bell-shaped distribution, about 95% of the data falls within two standard deviations of the mean. The mean is 13 minutes, and two standard deviations (2*2) is 4 minutes. Therefore, the interval is 13 ± 4, which is 9 to 17 minutes.

Use the Following Statement to Answer the Questions Below