Question

4. A baker recorded the number of burnt marks on 22 samples (production days in July)...

4. A baker recorded the number of burnt marks on 22 samples (production days in July) of 500 rolls. Sample Number Number of burnt marks Sample Number Number of burnt marks

(a) Develop an appropriate control chart to determine if the process is in statistical control.

(b) Compute the centerline and control limits for the control chart for the average number of burnt marks per unit. Do not redraw the chart.

Sample

Number

Number of burnt marks

Sample

Number

Number of burnt marks

1

120

12

280

2

60

13

140

3

140

14

150

4

110

15

130

5

160

16

20

6

90

17

90

7

110

18

100

8

170

19

140

9

80

20

110

10

130

21

130

11

210

22

160

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