A drilling and deburring process has tolerances of plus or minus .01 centimeters.What does the process standard deviation need to be in order for this process to have a capability ratio of 1.50?
A)0.0022 millimeters
B)0.0001 millimeters
C)0.0022 centimeters
D)0.00001 centimeters

Question

Quizplus · Accepted Answer

The capability ratio is calculated by dividing the specification width (0.02 cm) by six times the standard deviation. So, solving for the standard deviation:
1.5 = 0.02 / (6 * standard deviation)
1.5 = 0.00333 / standard deviation
standard deviation = 0.00333 / 1.5 = 0.0022 cm. Therefore, the answer is C, 0.0022 centimeters.

A Drilling and Deburring Process Has Tolerances of Plus or Minus