A production manager at a Contour Manufacturing plant has inspected the number of defective plastic molds in five random samples of 25 observations each. Following are the number of defective molds found in each sample:
| Sample |
|
Number of
Defects |
|
Number of
Observations
in Sample |
| 1 |
|
2 |
|
25 |
| 2 |
|
3 |
|
25 |
| 3 |
|
0 |
|
25 |
| 4 |
|
0 |
|
25 |
| 5 |
|
2 |
|
25 |
| Total |
|
7 |
|
125 |
Construct a 3-sigma control chart (z = 3) with this information. (If the lower control limit is negative, round the LCL to zero and all other answers to 2 decimal places, e.g. 15.25.)