CPM Homework Help : INT3 Problem 7-120

A company makes metal plates on which they put a special coating. Flaws appear in the finish of these metal plates and the company wants to establish a quality control system. A machine scans each plate after it is finished and reports the number of flaws. The data they collect for $50$ samples is sorted and shown below.

$0$

$1$

$2$

$3$

$4$

$5$

$6$

$7$

$8$

$9$

$10$

$11$

$12$

$13$

$14$

$21$

checksum $360$

Think about the quality control bounds for this company. Should you reject plates that have too few flaws? What upper and lower bounds make sense?

Answer:

Reject the upper $10\%$ of the data.