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The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company's policy is a 23% allowance for workers. (Please show work. Needing to verify calculations)

a) Compute the standard time for the bag-packing task.

b) How many observations are necessary for 99% confidence, within +/- 5% accuracy?