1.

Compute the lower and upper control limits for X̄-chart when X̄1 =40, σ1 = 6 and A = 1.342.

Answer»

L.C.L = X̄1 – Aσ1 = 40 – (1.342 × 6) = 31.948 U.C.L 

= X̄1 + Aσ1 = 40 + (1.342 × 6) = 48.052



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