If you inspect 50 automobile windshields and find 266 nonconformities, determine the upper and lower control limits for the c-charts.

Expert Answers

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The upper and lower class limits for the c-chart are given by the formula:

`UCL_c=barc+3sqrtbarc`

`LCL_c=barc-3sqrtbarc` 

 `barc` = Number of defects/Observations

`barc=266/50=5.32`

`UCL_c=5.32+3sqrt5.32`

`UCL_c=12.23953756`

`UCL_c~~12.24`

`LCL_c=5.32-3sqrt5.32`

`LCL_c=5.32-6.919537557=-1.599537557`

`:.LCL_c=0`

 

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