Suppose that we will take a random sample of size n from a population having mean and standard deviation . For each of the following situations, find the mean, variance, and standard deviation of the sampling distribution of the sample mean x : (b) =551,=.5,n=95 (Round your answers of " x " and " x2 " to 4 decimal places.) (c) =7,=.4,n=4 (Round your answers of " x " and " x2 " to 4 decimal places.) (d) =110,=6,n=1,406 (Round your answers of " x " and " x2 " to 4 decimal places.)