Question 10.10: Rolls of sheet aluminum, used to manufacture cans, are exami...

Principles of Statistics for Engineers and Scientists

Rolls of sheet aluminum, used to manufacture cans, are examined for surface flaws. Table 10.3 presents the numbers of flaws in 40 samples of 100 m² each. Compute the center line and 3σ control limits for the c chart. Plot the chart. Does the process appear to be in control?

TABLE 10.3 Number of flaws, for Example 10.10
Sample	Number of Flaws (c)	Sample	Number of Flaws (c)	Sample	Number of Flaws (c)	Sample	Number of Flaws (c)
1	16	11	14	21	11	31	10
2	12	12	11	22	16	32	10
3	9	13	10	23	16	33	10
4	13	14	9	24	13	34	12
5	15	15	9	25	12	35	14
6	5	16	14	26	17	36	10
7	13	17	10	27	15	37	15
8	11	18	12	28	13	38	12
9	15	19	8	29	15	39	11
10	12	20	14	30	13	40	14

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