Neil is in charge of setting up a p-chart for a new manufacturing process for percent defective units. He takes five samples and the defect rate for each sample is as provided in Graph 1, below:

With these data, the center line for his p-chart will be (select the closest response):

9%

10%

12%

Center line cannot be calculated

11%

Percent Sample size (n) 100 150 200 150 100 Number Defective 20 20 10 10 10 | Defective(p 0.20 0.13 0.05 0.07 0.10