"If there are 60 total defects from 8 samples, each sample consisting of 45 individual items in a production process, what is the standard deviation of the sample proportion, Sp?" Is what it refers to by question 3.

QUESTION / In question 3, the upper control limit (UCL) of R bar chart is (refer to the following table if needed). Keep two decimals if applicable. Factor for R Chart Factor Number for X- Lower Upper of Observations bar Control Control in Subgroup Chart Limit Limit n A2 D3 DA 1.88 0.00 3.27 W N 1.02 0.00 2.57 4 0.73 0.00 2.28