SOLUTION: The shape of the distribution of the time required to get an oil change at a 20​-minute ​oil-change facility is unknown.​ However, records indicate that the mean
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Question 1083369: The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is unknown. However, records indicate that the mean time is 21.5 minutes, and the standard deviation is 4.3 minutes.
The probability is approximately? Answer by Fombitz(32388) (Show Source):
