Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation, then what will be the new mean and new standard deviation respectively?

Mean of 100 observations is 50 and standard deviation is 10. If 5 is a

1.	Mean of 100 observations is 50 and standard deviation is 10. If 5 is added to each observation, then what will be the new mean and new standard deviation respectively?
A.	50, 10
B.	50, 15
C.	55, 10
D.	55, 15
Answer» D. 55, 15