An Importer of Decorative Ceramic Tile Samples 50 Tiles Each

Essay

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.
a. What type of control chart should be used by the importer in monitoring the proportion of scrap tiles?
b. Calculate the centreline for this control chart.
c. Calculate the control limits for this control chart.