Service time is targeted for 15 minutes with an upper and lower specification of 16 and 14 min. ,respectively.The process standard deviation is 0.2 min.and the process average is 14.8 min.What is the process capability ratio?
A)1.33
B)1.50
C)1.66
D)2.00

Question

Quizplus · Accepted Answer

Process capability ratio = (Upper specification limit - Lower specification limit) / (6 * Process standard deviation)
= (16 - 14)/ (6*0.2)
= 1.67
Therefore, the process capability ratio is 1.67, which is closest to the given option C) 1.66.

Service Time Is Targeted for 15 Minutes with an Upper