If Random Samples,each with N = 36 Scores,are Selected from a Normal

Multiple Choice

If random samples,each with n = 36 scores,are selected from a normal population with µ = 80 and σ = 18,how much difference,on average,should there be between a sample mean and the population mean?​

A) 2 points​
B) ​3 points
C) ​6 points
D) ​18 points