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18 February, 07:34

Cory's average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

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  1. 18 February, 10:41
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    add all the scores together and the divided by the number of scores there are

    8 tests will be 8x91 = 728

    Then add on his latest test result 728+78 = 806

    Now divide by the number of tests (9) 806/9 = 89.55555555

    89.555%
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