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Five samples of size 4 were taken from a process. The average of the range values...

Five samples of size 4 were taken from a process. The average of the range values was 2.35. The average of the sample means was 19.64. What is the upper control limit of the X-bar chart? a. 21.35

b. None of the responses provided is correct.

c. 33.72

d. 21.00

e. 26.94

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Answer #1

Answer is option C

c. 33.72

Factor for X-bar ChartA2 for Sample Size, N= 4 is 0.73

Upper control limit of the X-bar chart = sample mean + (0.73*range value) = (19.64 + (0.73*2.352) = 33.72

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