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Please solve it easy way. Assume a normal distribution with known population variance. Calculate the lower...

Please solve it easy way.

Assume a normal distribution with known population variance. Calculate the lower confidence limit (LCL) and upper confidence limit (UCL) for each of the following.
1. ?̅ = 50; n = 64; ? = 40; α = 0.05
2. ?̅ = 85; n = 225; ?2 = 400; α = 0.01
3. ?̅ = 510; n = 485; ? = 50; α = 0.10

Math   Statistics-And-Probability   
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