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Based on a careful work study in the Richard Dulski Corp., the results shown in the following table have been observed: Observations (minutes) 1 2 Performance Element 3 Rating (%) Prepare daily reports Photocopy results Label and package reports Distribute reports 35 40 33 42 39 12 10 36 15 13 5 4 120 110 90 85 3 5 15 18 21 17 45b a Photocopyirig machine broken; included as delay in the allowance factor. b Power outage; included as delay in the allowance factor. (a) Compute the normal time for each work element. (b) If the allowance for this type of work is 15%, what is the standard time? (c) How many observations are needed for a 95% confidence level within 5% accuracy?