The monthly amounts spent for food by families of four receiving food stamps approximates a symmetrical, normal distribution. The sample mean is $150 and the standard deviation is $20. Using the Empirical Rule, about 95% of the monthly food expenditures are between what two amounts?

Question

Quizplus · Accepted Answer

The Empirical Rule states that for a normal distribution, about 95% of the data falls within two standard deviations of the mean. In this case, the mean is $150 and the standard deviation is $20, so two standard deviations from the mean is $150 +/- $40, or $110 to $190.

The Monthly Amounts Spent for Food by Families of Four