The mean and standard deviations of 10 observations are 35 and 2 respectively. If each observation is increased by 4, the changed mean and standard deviation respectively will be-
A. 35 and 2
B. 40 and 4
C. 39 and 2
D. None of the above
Answer:C
The mean and standard deviations of 10 observations are 35 and 2 respectively. If each observation is increased by 4, the changed mean and standard deviation respectively will be-
A. 35 and 2 B. 40 and 4 C. 39 and 2 D. None of the above