Process Capability Index – Shape my Grade

Determine the Process Capability Index of the three processes given below and determine whether the processes are capable or not.
Process
Mean
Variance
Lower Specification Limit
Upper Specification Limit
1
7.5
0.01
7.0
8.0
2
4.6
0.0144
4.3
4.9
3
6.0
0.0196
5.5
6.7