Ten samples of a process measuring the number of returns per 200 receipts were taken for a local retail store. The number of returns were 10, 9, 11, 7, 3, 12, 8, 1, 1, and 4. Find the standard deviation of the sampling distribution for the p-bar chart. Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 Sample 9 Sample 10 10 11 3 12 8 op p(1-P) n