The company has kept at one of its plants 24 months records of the total number of failures occurring each month, as shown in Table Q5. Produce the 3-month moving average and the 6-month moving average plots, together with the CUSUM plot (assume the target is 18).

Table Q5

Month	Failure
1	21
2	27
3	23
4	22
5	26
6	25
7	23
8	19
9	21
10	23
11	23
12	18
13	22
14	25
15	23
16	22
17	19
18	21
19	21
20	25
21	22
22	27
23	27
24	29

Answer rating: 100% (QA)

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