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math

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on 3 tests you earned grades of 88%,94%,and 90%. Each test was worth 150points. The final exam is worth 250 points. How many points do u need on the final exam to earn 93% of the total points on tests? What percent do you need on the final?

  • math - ,

    Let's figure the total number of points you've earned.

    0.88 * 150 = 132
    0.94 * 150 = 141
    0.9 * 150 = 135

    Total points = 408

    450 + 250 = 700 points possible

    0.93 * 700 = 651 points you need to have an over all average of 93%

    651 - 408 = 243 points needed on the final exam

  • math - ,

    243/250 = 97.2% needed on final exam

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