If mean and standard deviation of 5 observations x1, x2, x3, x4, and x5 are 10 and 3 respectively, then the variance of 6 observations x1, x2, x3, x4, x5 and -50 is equal to:

If mean and standard deviation of 5 observations x1, x2, x3, x4, and x

1.	If mean and standard deviation of 5 observations x1, x2, x3, x4, and x5 are 10 and 3 respectively, then the variance of 6 observations x1, x2, x3, x4, x5 and -50 is equal to:
A.	509.5
B.	586.5
C.	582.5
D.	507.5
Answer» E.