Q. 124.4( 5 Votes )

The mean of 150 items was found to be 60. Later on, it was discovered that the values of two items were misread as 52 and 8 instead of 152 and 88 respectively. Find the correct mean.

Answer :

Calculated mean of 150 items = 60


Incorrect sum of 150 items = 60×150 = 9000


Correct sum of 150 items = (incorrect sum) - (incorrect items) + (correct items)


= 9000 – (52 + 8) + (152 + 88)


= 9000 – 60 + 240


= 9240 – 60 = 9180


Correct mean =


So, correct mean is 61.2.


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