The quality of an electronic component used in manufacturing cell phones is monitored with a p chart.In the last 20 days,daily samples of 75 units resulted in the following number of defective units per sample: 8,4,3,7,3,1,0,7,4,2,0,1,6,2,4,3,1,2,8,and 5.Find the appropriate center line.
A).0473
B).2667
C).1067
D).0133

Question

Quizplus · Accepted Answer

The center line of a p chart is calculated by dividing the total number of defects by the total number of units inspected. In this case, the total number of defects is 8+4+3+7+3+1+0+7+4+2+0+1+6+2+4+3+1+2+8+5 = 71, and the total number of units inspected is 20 * 75 = 1500. Therefore, the center line is 71 / 1500 = 0.0473.

The Quality of an Electronic Component Used in Manufacturing Cell