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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. - Mathematics

MCQ

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

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Solution

64.75

Explanation:

Error in sum`=72+90-27-9=126`

The error means `=126/72=1.75`

Concept: Arithmatic (Entrance Exam)
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