Question

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

Answer 1

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