A national chain of automobile oil - change franchises claims that your hood will be open for
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Question:
A national chain of automobile oilchange franchises claims that "your hood will be open for less than minutes when we service your car." To check their claim, undercover consumer reporters monitored the "hood time" of customers across a number of the chain's franchises. The data in minutes is here.
Find the proportion of the hood times within one standard deviation of the mean.
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