In previous problem 20.1, the design specification on the part is that the diameter = 30.000 ( 0.150 mm.
(a) What proportion of parts fall outside the tolerance limits?
(b) If the process is adjusted so that its mean diameter = 30.000 mm and the standard deviation remains the same, what proportion of parts fall outside the tolerance limits?
Problem 20.1
A turning process is in statistical control and the output is normally distributed, producing parts with a mean diameter = 30.020 mm and a standard deviation = 0.040 mm.