Multiple Choice Questions on The arithmetic mean of the scores of a group of students in a test was 52 The brightest 20 of them s........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

The arithmetic mean of the scores of a group of students in a test was 52 The brightest 20 of them s...........

Quantitative Aptitude ( CCS) Average
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    The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is:

    51.4

    Correct Answer

    52.6

    Incorrect Answer

    56.1

    Incorrect Answer

    55.3

    Incorrect Answer
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    Explanation:

    Let the required mean score be a
    Then, 20 x 80 + 25 x 31 + 55 x a = 52 x 100
    1600 + 775 + 55a = 5200
    55a = 2825
    a = 51.4

    By: Sandeep Dubey
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