Suppose a Random Sample of N = 36 Measurements Is $$\sigma ^ { 2 } = 144 \text {. Find the mean and standard deviation of the sampling distribution of the sample mean } \bar { x }$$

Suppose a random sample of n = 36 measurements is selected from a population with mean μ = 256 and variance $$\sigma ^ { 2 } = 144 \text {. Find the mean and standard deviation of the sampling distribution of the sample mean } \bar { x }$$