The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $37,200 and a standard deviation of $800. About 68 percent of the incomes lie between what two incomes?
A) $30,000 and $40,000
B) $36,400 and $38,000
C) $34,800 and $39,600
D) $35,600 and $38,800
E) None of the choices are correct

Question

Quizplus · Accepted Answer

In a normal distribution, about 68% of the data falls within one standard deviation of the mean. Therefore, the range is $37,200 ± $800, which is $36,400 to $38,000.

The Distribution of the Annual Incomes of a Group of Middle