20 samples each of size 10 were inspected. The number of defectives detected in
each of them is given below:
0, 1, 0, 3, 9, 2, 0, 7, 0, 1, 1, 0, 0, 3, 1, 0, 0, 2, 1, 0
Find the control limits for the number of defectives and establish quality standards
for the future. Plot the graph and interpret.