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QUESTION
Fix it Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed...
Fix it Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed between 100 and 120 minutes? also 20% of their jobs take more than how much time?
