3
105
0.58
0.53
0.52
0.59
0.60
0.54
*Unusual delay, disregard time.
1. a. Based on the observations, determine the standard time for the operation,
assuming an allowance of 15 percent of job time. (Round your intermediate
calculations and final answers to 3 decimal places.)
Element
Standard time
6. Problem 7-11
How many observations should a time study analyst plan for in an operation that has a standard
deviation
of 1.7 minutes per piece if the goal is to estimate the mean time per piece to
within .2 minute with a confidence of 95.5 percent? (Do not round intermediate calculations.
Round up your final answer to
the next whole number.)