Find the interval [zn,+zn][zn,+zn] within which 95 percent of the sample means would be expected to fall, assuming that each sample is from a normal population. (a) = 179, = 10, n = 33. (Round your answers to 2 decimal places.)

the 95% range is from ? to ?

(b) = 867, = 18, n = 10. (Round your answers to 2 decimal places.)

the 95% range is from ? to ? (c) = 63, = 4, n = 27. (Round your answers to 3 decimal places.)

the 95% range is from ? to ?