If the average of five observations a1,a2,a3,a4 and a5 is N, then what is the average of five new observation a1 - 100, a2- 100, a3 - 100, a4 - 100, and a5 -100 ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. N - 100
If Average of a set is X and A is subtracted from all numbers of a set then average is also reduced by A.
A/c to question
if 100 is subtracted from all numbers of a set then average will also reduced by 100 . Hence average becomes N - 100.