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According to the U.S. Environmental Protection Agency, a sample of 10 subcompact models shows the following...

According to the U.S. Environmental Protection Agency, a sample of 10 subcompact models shows the following estimated values for highway fuel economy (mpg): 40, 33, 32, 30, 27, 29, 27, 23, 21, and 10. The ∑x = 272 and the ∑x2 = 7982. Based on this sample, at least 89% of all subcompact model values for highway fuel economy (mpg) would fall within

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