69-The mean of 100 items was found to be 40. If at the time of calculation two items were wrongly taken as 36 and 32 instead of 54 and 34, the correct mean is
A. 39.8
B. 39.9
C. 40.1
D. 40.2
Answer:D
69-The mean of 100 items was found to be 40. If at the time of calculation two items were wrongly taken as 36 and 32 instead of 54 and 34, the correct mean is
A. 39.8 B. 39.9 C. 40.1 D. 40.2