The frequency distribution at the left shows the out-of-pocket prescription medicine expenses (in dollars) for 30 U.S. adults in a recent year. Use the frequency distribution to estimate the mean expense. Using the sample mean formula with the original data set, the mean expense is $285.50. Compare this with the estimated mean.

Sample mean formula

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Class midpoint, Frequency, f xf 172.5 208.5 244.5 325 517.5 417.0 1222.5 280.5 6 1683.0 316.5 7 2215.5 352.5 4 1410.0 388.5 3 1165.5 n = 30 = 8631