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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