Use the 68-95-99.7 rule to solve the problem.
-For adults in the town of Bridgeport, systolic blood pressure is normally distributed with a mean of 130 mmHg and a standard deviation of 11 mmHg. What percentage of adults in the town have a
Systolic blood pressure less than 97 mmHg?
A)99.7%
B)99.85%
C)0.3%
D)0.15%

Question

Quizplus · Accepted Answer

According to the 68-95-99.7 rule, 99.7% of data falls within three standard deviations from the mean. A blood pressure of 97 mmHg is more than three standard deviations below the mean (130 - 3*11 = 97). Therefore, only 0.15% of adults have a systolic blood pressure less than 97 mmHg.

Use the 68-95-99.7 Rule to Solve the Problem