a) \(\bar{\bar{x}} + A_2 R \)
b) \(\bar{\bar{x}} – A_2 R\)
c) \(\bar{\bar{x}} + A_2 \bar{R}\)
d) \(\bar{\bar{x}} + A_3 R\)
Upper control limit for a x chart is expressed by ________
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answerhappygod
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Upper control limit for a x chart is expressed by ________
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