The ages of all high school teachers in New York state have a bell-shaped distribution with a mean of 45 years and a standard deviation of 7 years.According to the empirical rule,the percentage of teachers in this state who are 24 to 66 years old is approximately:
A)99.4%
B)97.9%
C)98.3%
D)99.7%

Question

Quizplus · Accepted Answer

According to the empirical rule, approximately 99.7% of data in a bell-shaped distribution falls within three standard deviations of the mean. Here, 24 to 66 years is within three standard deviations (21 years) from the mean (45 years).

The Ages of All High School Teachers in New York