If \(\rm \sum x_i = 20, \sum x_i^2=200\) and n = 10 for an observed variable x, then what is the coefficient of variation?

If \(\rm \sum x_i = 20, \sum x_i^2=200\) and n = 10 for an observed

1.	If \(\rm \sum x_i = 20, \sum x_i^2=200\) and n = 10 for an observed variable x, then what is the coefficient of variation?
A.	80
B.	100
C.	150
D.	200
Answer» E.