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Question
Choose the most appropriate option:
The mean of 72 items was found to be 63. If two of the items were misrecorded as 27 and 9 instead of 72 and 90 respectively, find the correct mean.
Options
64.25
64.75
63.25
65.75
Solution
64.75
Explanation:
Error in sum`=72+90-27-9=126`
The error means `=126/72=1.75`
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