hi, thanks for your help

Based on a pilot study of 15 work cycles you determine that (for a single element activity) the sample mean element time is 5 minutes and the sample standard deviation is 0.5 minutes. If your study is based on a total error of 2 % and your tolerance is 0.2, how many cycles of this element should you study? Use 140.01 - 2.624 Select one: O a. 66 O b. 43 O C. 44 0 0. 65 O e. 2