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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.
Solution
The mean of 200 items = 50
Then the sum of 200 items = 20050 = 10, 000
Correct values = 192 and 88
Incorrect values = 92 = 8
∴ Correct sum =10000 - 92 - 8 +192 + 88 = 10180
∴ Correct mean = `10180/200 = 50 .9`
= `10180/2 = 50 .9`
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