Consider the following data related to the number of units that 6 sales representatives have sold during the last month,

S. No	1	2	3	4	5	6
Sales	50	52	57	59	60	63

1. Calculate mean µ and standard deviation σ.
2. Assuming that you sample without replacement, select all possible of n = 2 and construct the sampling distribution of the mean. Compute the mean and standard deviations of all the sample means.
3. Verify that

1. Ex=μ
2. .S.Ex=σn.N-nN-1