A time study analyst has collected 10 readings on a particular work element of interest and would like to consider how many more cycles to time. Based on the sample, the mean time for the element is 0.40 min and the sample standard deviation is 0.07 min. At 95% confidence level, how many cycles should be timed to ensure the actual element time is within +/- 10% of the mean? z = 2.262 Select one: a. 15 O b. 17 O c. 14 d. 16 e. 18 O

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