Question

the mean of 80 items was found to be 25. at the time of calculation it was a found that two items were wrongly taken as 60 and 40 instead of 16 and 4, then the correct mean is​

Answer 1

The correct mean is 24.

Explanation:

The total sum of the 80 items is 80 * 25 = 2000.

The total sum of the 80 items after the two items are corrected is 2000 - 60 - 40 + 16 + 4 = 1980.

The correct mean is 1980 / 80 = 24.

Here is the calculation:

Correct mean = (Sum of all items - sum of wrongly taken items + sum of correctly taken items) / number of items

= (2000 - 60 - 40 + 16 + 4) / 80

= 1980 / 80

= 24