Where should the control limits in an X-bar chart be placed if the design of the process

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Where should the control limits in an X-bar chart be placed if the design of the process sets a = 0.01 with the following parameters (assume that the sample size condition for control charts has been verified)?
(a) µ = 100, σ = 20, and n = 25 cases per batch

(b) µ = 2000, σ = 2000 and n = 100 cases per batch

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