Switch production

In the automatic production line of small switch, the switch quality fails seriously in production. When it fails is identified by the percentage of unqualified products.

A total of 25 groups of data are collected as follows:

4000 8

4000 14

4000 10

4000 4

4000 13

4000 9

4000 7

4000 11

4000 15

4000 13

4000 5

4000 14

4000 12

4000 8

4000 15

4000 11

4000 9

4000 18

4000 6

4000 12

4000 6

4000 12

4000 8

4000 15

4000 14