If the total number of observations is 20, ∑ xi = 1000 and \(\sum {\rm{x}}_{\rm{i}}^2 = 84000\), then what is the variance of the distribution?

If the total number of observations is 20, ∑ xi = 1000 and \(\sum {\

1.	If the total number of observations is 20, ∑ xi = 1000 and \(\sum {\rm{x}}_{\rm{i}}^2 = 84000\), then what is the variance of the distribution?
A.	1500
B.	1600
C.	1700
D.	1800
Answer» D. 1800