16. A control chart is being used to control a manufacturing process. As
part of the control a sample of five parts is taken from the manufactur-
ing process each hour of operation. Each of the five parts is measured,
and the dimension is recorded on the work sheet. The average of the
five parts is plotted on the control chart. This is called which of the
following values?
a. X
b. X bar
c. Sample average
d. Control average
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