Snipper, Inc

Essay

Snipper, Inc. manufactures lawnmowers that require minor, final assembly by the customer. A sealed plastic bag containing the hardware (nuts, bolts, washers, and so on) needed for final assembly is included with each lawnmower shipped. During a week of normal, in-control operation, twenty samples of 200 bags of hardware were examined for content (hardware type and count) accuracy. A total of 104 bags of the 4000 examined failed to have the correct contents.
a. Compute the upper limit, center line, and lower limit for a p chart.
b. Compute the upper limit, center line, and lower limit for an np chart.