Transistor production

 

A P-chart of nonconforming products within one month shall be established for transistor production. a sample shall be taken every day within one month and the number of nonconforming products shall be checked. A total of 26 days of data shall be taken.

 

The data are as follows:

Number of inspections

Number of nonconformities (nP)

158

11

140

11

140

8

155

6

160

4

144

7

139

10

151

11

163

9

148

5

150

2

153

7

149

7

145

8

160

6

165

15

136

18

153

10

150

9

148

5

135

0

165

12

143

10

138

8

144

14

161

20