What is the UCL for the revised Xbar chart? (Assume that assignable causes are found and eliminated

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What is the UCL for the revised Xbar chart? (Assume that assignable causes are found and eliminated for all of the out-of-control signals in the trial chart.)

a. 1.67

b. 1.77

c. 2.67

d. 2.90

e. 3.10

f. None of the above is correct.

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