math

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I have a 76 average right now, what grades do I need to get if i have 5 more tests and need to get an 85 average?

  • math -

    Depends on how many tests you have already taken. If you have taken n tests so far, then the average on the next 5 tests must be m, where

    76n + 5m = 85(n+5)
    m = 85 + 9/5 n

    Assuming all tests are weighted equally. As you can see, the more low scores you have contributing to the 76 average, the higher grade it will take to achieve a final 85.

    In fact, if you have 9 low scores, there is no way to raise your average to 85 with 5 more tests.

    9*76 = 684
    14*85 = 1190
    Points needed: 506
    no way to get that many points in 5 tests.

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