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IM & OR work measurement

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asked in IM&OR by (215k points)
7,7,7,6,6,9,8 and 6 are the times recorded for one element of operation. How many cycles are necessary for time study if the erros is not to exceed 5 percent at the confidence level of 99.7%?

 

(a) 32               (b) 72              (c) 96               (d) 144

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