Develop time standard for certain task

A methods and measurement analyst wants to develop a time standard for a certain task. In a preliminary study, he observed one worker perform the task six times with an average observed time of 20 seconds and a standard deviation of two seconds.

What is the normal time for this task if the employee worked at a 20 percent faster pace than average?

4 seconds

16.7 seconds

20 seconds

24 seconds

100 seconds

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