Floyd Electric Is Fabricating Flanges for a New Electrical Motor

Multiple Choice

Floyd Electric is fabricating flanges for a new electrical motor.The flange is to be 25 millimeters in diameter with an upper tolerance limit of 26.5 millimeters and a lower tolerance limit of 23.5 millimeters.Bill Floyd took a sample consisting of ten flanges,measured the diameter and recorded the observations in the table. What is Floyd Electric's process standard deviation?

A) 0.15
B) 0.17
C) 0.42
D) 0.39