Question

If the age distribution of customers at a major retail chain is thought to be bell-shaped with a mean equal to 43 years and a standard deviation equal to 7 years, the percentage of customers between the ages of 29 and 57 years is:

Answer 1

Around 95%

Step-by-step explanation:

If the customer population follows a bell-shaped distribution, it means that the age distribution is normal.

For normal populations, around 95% of elements are within two standard deviations from the mean.

In this case, two standard deviations would be:

43+14 = 57

43-14 = 29

Therefore, the percentage of customers who are between 57 and 29 years of age is around 95%.