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) None of the choices are correct.

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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) None of the choices are correct.

If He Uses Upper and Lower Control Limits of 520