Suppose the Annual Out-Of-Pocket Health Care Expenses for Retirees Have

Multiple Choice

Suppose the annual out-of-pocket health care expenses for retirees have a mean of $10,700 and a standard deviation of $2,500. The percentage of retirees with annual out-of-pocket health care costs between $5,700 and $15,700 is

A) approximately 95.
B) at least 89.
C) approximately 68.
D) at least 75.