Practice Test Discussion

Q)

The average marks of 100 students were found to be 40. Later on it was discovered that a score of 53 was misread as 83. The correct average corresponding to the correct score is?

    • Explanation

    Given,

    Average marks of 100 students were found to be 40

    Sum of observation

    =100×40= 4000

    Later on it was discovered that a score of 53 was misread as 83.

    (Correct score= Sum of observation+ correct score- incorrect score)

    The correct marks of 100 students

    = 4000+53-83= 3970

    ∴ Required average = 3970100= 39.7

    Hence, Option C is correct.

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