Find the interval

within which 95 percent of the sample means
would be expected to fall, assuming that each sample is from a normal population.
(a) μ = 179, σ = 10, n = 33. (Round your answers to 2 decimal places.)
The 95% range is from ___ to _____ .
(b) μ = 867, σ = 18, n = 10. (Round your answers to 2 decimal places.)
The 95% range is from to .
(c) μ = 63, σ = 4, n = 27. (Round your answers to 3 decimal places.)
The 95% range is from to .
Help?