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23 January, 05:44

The average test mark of the class? mark of a class of 20 student is 65. Twum's mark was recorded as 35 instead of 55. What is the correct average mark of the class

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  1. 23 January, 07:14
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    66

    Step-by-step explanation:

    Wrong total mark = 65 * 20 = 1,300

    remainder of Tum score to be added = 55-35 = 20

    Add this to total = 20 + 1300 = 1320

    Correct average score = 1320/20 = 66
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