Let x1, x2, ....., xn be n observations such that ∑x2i = 400 and ∑xi = 80. Then a possible value of n among the following is

Let x1, x2, ....., xn be n observations such that ∑x2i = 400 and �

1.	Let x1, x2, ....., xn be n observations such that ∑x2i = 400 and ∑xi = 80. Then a possible value of n among the following is
A.	10
B.	15
C.	20
D.	8
Answer» D. 8