Assume a normal distribution with known population variance. Calculate the LCL and UCL for each of the

Question:

Assume a normal with known population variance. Calculate the LCL and UCL for each of the following.
a. x-bar = 50; n = 64; σ = 40; α = 0.05
b. x-bar = 85; n = 225; σ2 = 400; α = 0.01
c. x-bar = 510; n = 485; σ = 50; α = 0.10 Distribution
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