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20 January, 19:39

There are 30 students in a class that took a test. The average grade of 10 students was 80. The other 20 students average was 89. What is the overall average for all 30 students?

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  1. 20 January, 22:30
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    10 students averaged 80, so the sum of their scores was (10 x 80) = 800

    20 students averaged 89, so the sum of their scores was (20 x 89) = 1,780

    All together, the sum of all 30 scores was (800 + 1,780) = 2,580

    30 students totaled 2,580, so their average was (2,580 / 30) = 86.
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