Floyd Electric Is Fabricating Flanges for a New Electrical Motor $$\begin{array} { | l | l | l | l | l | l | l | l | l | l } 25.69 & 25.58 & 24.78 & 24.94 & 24.87 & 24.63 & 25.70 & 25.52 & 24.95 & 24.91\end{array}$$

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. $$\begin{array} { | l | l | l | l | l | l | l | l | l | l } 25.69 & 25.58 & 24.78 & 24.94 & 24.87 & 24.63 & 25.70 & 25.52 & 24.95 & 24.91\end{array}$$ What is Floyd Electric's process standard deviation?

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