The following data represent the results of inspecting all personal computers pro- duced at a given plant during the past 12 days.
|
Day
|
Number of Units
|
NumberDefective
|
|
1
|
80
|
5
|
|
2
|
110
|
7
|
|
3
|
90
|
4
|
|
4
|
80
|
9
|
|
5
|
100
|
12
|
|
6
|
90
|
10
|
|
7
|
80
|
4
|
|
8
|
70
|
3
|
|
9
|
80
|
5
|
|
10
|
90
|
6
|
|
11
|
90
|
5
|
|
12
|
110
|
7
|
Does the process appear to have been in control? Determine control limits for future production.