An initial time study was done on a process with the following results (in minutes). Based on the data obtained so far, assuming an allowance of 20 percent of the normal time, what do you estimate for the time per unit customer served, based on this preliminarysamples?

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Performance Obs Obs Obs Obs Obs Element Element 1 Element 2 Element 3 Rating 70 110 90 8 10 9 11 10