If All the Possible Random Samples with N = 36

Multiple Choice

If all the possible random samples with n = 36 scores are selected from a normal population with µ = 80 and σ = 18,and the mean is calculated for each sample,then what is the average of all the sample means?​

A) ​2
B) ​6
C) ​80
D) ​It cannot be determined without additional information.