If M is the mean of n observations x1 - k, x2 - k, x3 - k, _ _ _, xn - k, where k is any real number, then what is the mean of x1, x2, x3, _ _ _, xn?

If M is the mean of n observations x1 - k, x2 - k, x3 - k, _ _ _, xn -

1.	If M is the mean of n observations x1 - k, x2 - k, x3 - k, _ _ _, xn - k, where k is any real number, then what is the mean of x1, x2, x3, _ _ _, xn?
A.	M
B.	M + k
C.	M - k
D.	kM
Answer» C. M - k