A Post Office has initiated TotalQuality Management practices to measure the qua

Question

A Post Office has initiated TotalQuality Management practices to measure the quality of service anddetecting whether the process is in control or not throughstatistical process control methods (SPC). The operations managercollected a random sample size of 3000 postal deliveries and thenumber of defectives (wrong deliveries) was recorded. The data of15 weeks are shown as under.

Sample number

No. of defectives

Sample proportion defective(p)

1

16

2

13

3

20

4

3

5

18

6

6

7

26

8

9

9

8

10

24

11

14

12

5

13

12

14

19

15

18

Sample number

No. of defectives

Sample proportion defective(p)

1

16

2

13

3

20

4

3

5

18

6

6

7

26

8

9

9

8

10

24

11

14

12

5

13

12

14

19

15

18

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