Suppose the annual out-of-pocket health care expenses for retirees have a mean of $10,700 and a standard deviation of $2,500.

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