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Question -

The mean of 200 items was 50. Later on, it was discovered that the two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.



Answer -

Mean of 200 items = 50
Total = 50 x 200 = 10000
The number were misread as 92 instead of 192 and 8 instead of 88
Difference = 192 – 92 + 88 – 8 = 180
New total = 10000 + 180 = 10180
and new mean = 10180/200 = 50.9

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