If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control?
A)sample 1
B)sample 2
C)sample 3
D)both samples 2 and 3
E)all samples are in control

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The Answer of If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control?
A)sample 1
B)sample 2
C)sample 3
D)both samples 2 and 3
E)all samples are in control

If He Uses Upper and Lower Control Limits of 520