Miller Manufacturing has decided to use a p-Chart with an risk of 5% to monitor the proportion of defective metal shafts produced by their production process. The quality control manager randomly samples 150 metal shafts at 16 successively selected time periods and counts the number of defective metal shafts in the sample.

Sample Defects 1 -13 2 -11 3 -10 4 -7 5 -10 6 -11 7 -11 8 -10 9 -14 10- 14 11 -10 12 -9 13 -13 14 -11 15 -10 16 -12

What is the center line control? Upper limit? Lower limit?