Millionaires. Dr. Thomas Stanley of Georgia State University has collected information on millionaires, including their ages, since 1973. A sample of 36 millionaires has a mean age of 58.5 years and a standard deviation of 13.4 years.

a. Complete the following graph.

x – – x − 3s –

x − 2s –

x − s –

x + 3s –

x + 2s –

x + s 18.3 58.5 85.3

b. Fill in the blanks: Almost all the 36 millionaires are between and years old.

* Caffeinated Beverages and Diabetes.