Random samples of size n were selected from populations with the means and variances given here. Find

Question:

Random samples of size n were selected from populations with the means and variances given here. Find the mean and standard deviation of the sampling of the sample mean in each case:
a. n = 36, µ = 10, σ2 = 9
b. n = 100, µ = 5, σ2 = 4
c. n = 8, µ = 120, σ2 = 1
Distribution
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