Provide an appropriate response.
-The mean IQ score of adults is 100, with a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 70 and 130. (Assume the data set has a bell-shaped distribution.)
A)95%
B)68%
C)99.7%
D)100%

Question

Quizplus · Accepted Answer

The Empirical Rule states that for a bell-shaped distribution, approximately 68% of the data falls within one standard deviation of the mean, 95% within two standard deviations, and 99.7% within three standard deviations. A score between 70 and 130 is within two standard deviations (15*2 = 30) of the mean (100), so approximately 95% of adults have IQ scores in this range.

Provide an Appropriate Response