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Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an

R-chart is:

a. 0.0373 and 0.1864.

b. 0.223 and 0.

c. 0.0136 and 0.1864.

d. 0.223 and 0.1777

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Category:- Statistics and Probability
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