Question: During a time study in a machine shop, five observations of a milling operation performed by an operator whose rating factor is 95 percent yielded

During a time study in a machine shop, five observations of a milling operation performed by an operator whose rating factor is 95 percent yielded the following times (in minutes): 40, 48, 48, 46, and 42. The allowance for this type of operation is 15 percent.
a. Determine the normal time for this operation.
b. Determine the standard time for this operation.

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