If the average number of nonconformities per unit per sample is 0.074, what will be the lower control limit for the u-chart?

If the average number of nonconformities per unit per sample is 0.074,

1.	If the average number of nonconformities per unit per sample is 0.074, what will be the lower control limit for the u-chart?
A.	0.0414
B.	0.0221
C.	0.0
D.	-0.0513
Answer» D. -0.0513