For the overall population the IQ scores follow the unimodal

For the overall population, the IQ scores follow the unimodal, symmetric distribution with mean equal to 100 and variance equal to 225.

What is the best answer? (Hint: Use empirical rule)

Select one:

A. If you pick a person at random, the chance that his IQ falls between 100 to 115 is more than the chance that his IQ falls between 60-85.

B. If you pick a person at random, the chance that his IQ falls between 100 to 115 is less than the chance that his IQ falls between 65 to 80.

C. If you pick a person at random, the chance that his IQ falls between 100 to 115 is not comparable to his IQ falling between 60-85.

D. If you pick a person at random, the chance that his IQ falls between 100 to 115 is as compared to falling between 65 to 80 depends on the number of the outliers.

Solution

A. If you pick a person at random, the chance that his IQ falls between 100 to 115 is more than the chance that his IQ falls between 60-85.