Question 4

Special plastics,Inc has been making the blanks for credit cards for a number of years. They use p-charts to keep track of the number of nonconforming cards that are greeted each time a batch of blank cards is run. Two hundred cards are inspected per batch. The number of nonconforming cards from the last twenty batches is given in the table below

Batch	Nonconforming blank cards
1	22
2	32
3	24
4	20
5	18
6	24
7	24
8	30
9	18
10	26
11	32
12	46
13	30
14	24
15	22
16	22
17	28
18	32
19	20
20	26

Required

Construct the p-chart and determine the process capability. Explain all adjustments made if any, to arrive at the final answer.