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A hair dresser finds that the time taken to cut the men's hair follows a normal distribution with a mean of 30 minutes and a
A hair dresser finds that the time taken to cut the men's hair follows a normal distribution with a mean of 30 minutes and a standard deviation of 10 minutes. She notes that 36 males from a particular college take an average of 27 minutes to have their hair cut. Does this group take less time than usual to have their hair cut? Perform the requisite hypothesis test at 5% level of significance and draw appropriate conclusions
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