A ski tuning shop has set a goal not to exceed an average of 5 working days from the time the skis are brought in to the time they are finished. A random sample of 12 pairs of skis brought in for tuning showed the following service times (in days) : 7, 8, 8, 7, 7, 3, 2, 6, 8, 7, 5, 4.   Repair Time in Days (n = 12)         Days       7       8       8       7       7       3       2       6       8       7       5       4               (b) Calculate the test statistic. (Round your answer to 3 decimal places.)

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A: Hence, the population mean is $21.84

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