Question 121
The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added. The first is 18 greater than the actual number and the second number added is 13 instead of 31. Find the correct average.
Solution
To rectify the mistake, we need to do the operation on the total = $$(-18)+(-13+31)=0$$
$$\because$$ By adding zero, there will be no change in the sum of the numbers, thus the average will remain same = 40.2
=> Ans - (A)
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