An importer of decorative ceramic tile samples 50 tiles each day from incoming shipments.Some tiles are cracked or broken before or during transit, rendering them useless scrap.Sampling from incoming shipments for 30 days reveals that a total of 250 tiles are cracked or broken.The centerline on the p chart for these data is ________________________ .
A)0.250
B)1.83
C)2.5
D)0.167
E)6.1

Question

Quizplus · Accepted Answer

The centerline on the p chart is calculated as the total number of defects divided by the total number of units inspected. Here, 250 tiles are cracked or broken out of 1500 tiles inspected (50 tiles/day * 30 days). Therefore, the centerline is 250/1500 = 0.167.

An Importer of Decorative Ceramic Tile Samples 50 Tiles Each