For standard values of mean and standard deviation used, what does the – McqOptions

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1.	For standard values of mean and standard deviation used, what does the center line of the R chart represent?
A.	R bar
B.	d<sub>2</sub> ‚âà√¨‚àö√¢
C.	D<sub>2</sub> ‚âà√¨‚àö√¢
D.	d<sub>2</sub> <span style="text-decoration:overline;">R</span>
Answer» C. D<sub>2</sub> ‚âà√¨‚àö√¢

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