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    khush998's Avatar
    khush998 Posts: 4, Reputation: 1
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    #1

    Sep 12, 2012, 03:37 AM
    Average
    The average mark of 12 students is 40. In the mean time it was detected that marks obtained by one of the students is considered 42 instead of 54 and other ones taken 74 instead of 50. Find the correct average.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 12, 2012, 05:12 AM
    The mean mark is given by: Total marks/Total students

    By how much does the total mark change from the given information?
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