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Question 67
The mean of 22 observations is 35. It was later discovered that 16 and 24 are misread as 31 and 42. What is the correct mean?
Solution
Given average=35
Sum=35*22
=770
Adding and removing the original values and misread values respectively i.e
770-72+42
=738
Correct mean=738/22
=33.54
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