Suppose that we will take a random sample of size n from a population having mean / and standard deviation o. For each of the following situations, find the mean, variance, and standard deviation of the sampling distribution of the sample mean x : (a) = 12, 0 =5, n= 28 (Round your answers of " : " and "o ; 2" to 4 decimal places.) OX (b) = 539, 0 = .4, n= 96 (Round your answers of " : " and " ; 2" to 4 decimal places.) UX Ox 2 OX (c) #= 7, 0=1.0, n=7 (Round your answers of "G : " and "g ; 2" to 4 decimal places.) UX OX 2 OX