A producer of contact lenses regularly takes samples of 100 lenses and inspects them for scratches. If a lens has a single scratch, it cannot be sold. The results of 10 samples are shown. What sample is out of control?
A) 2
B) 4
C) 6
D) 8
E) none of the above

Question

Quizplus · Accepted Answer

To determine if a sample is out of control, we need to know the control limits or the expected range of defects. Without specific data on the number of defects in each sample or the control limits, we cannot identify any sample as out of control. Therefore, "none of the above" is the correct choice.

A Producer of Contact Lenses Regularly Takes Samples of 100