C-CHART To monitor the number of blemishes on a polished surface a company randomly selects 10...
C-CHART
To monitor the number of blemishes on a polished surface a company randomly selects 10 units of output from its process and counts the number of blemishes on each unit. The sample results are shown below
| SAMPLE NO. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| # BLEMISHES | 17 | 19 | 15 | 18 | 16 | 14 | 15 | 16 | 15 | 15 |
Determine the upper and lower control limits for 3-sigma control chart to monitor the number of blemishes per unit
Homework Answers
c (True defective) = Total number of defects/Number of sample = (17+19+15+....................+15+15)/10 = 160/10 = 16
standard deviation (s) = sqrt(c) =sqrt(16) = 4
z = 3
UCL = c + z*s = 16+3*4 = 28
LCL = c - z*s = 16 - 3*4 = 4
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