First calculate ZL using minitab.
Calc>prob distr.normal> enter the mean> enter the SD and activate the input constant > enter LS.
Do the same with the USL.
The outcome ZL= 0.0000015
ZU=0.977250
Since this is the Lower Spec Limit and Minitab gives us the area to theleft of the specified value, this will be the proportion that is below thelower spec limit. It is not necessary to subtract this result from 1.0.
This is the Upper Spec Limit. Minitab provides us with the area underthe curve to the left of this value. We need the area to the right (abovethe spec limit), so we must subtract from 1.0.
This makes : 1-0.977250 =0.02275
Totaal 0.02275+0.0000015=0.0227515
Scrap : 0.0227515*652=14.83
.
