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Posted By Admin @ Mar 02, 2022

The mean in the above table is denoted with m. In the first step, the sum of all the proportion of defective items is calculated that is 0.21. After calculating total defective proportions the mean of the proportionate defective is evaluated by dividing the total with the number of samples. The mean of proportionate defective is 0.0175.

For evaluating the UCL & LCL first standard deviation is calculated. The formula of standard deviation is:

When the standard deviation is calculated, the UCL and LCL can be calculated. In the above table, it can be seen that the UCL is 0.056 and LCL is -0.151 (Anderson, Sweeney, & Williams, 2010).

a. Draw a control chart and plot each of the sample measurements on it?