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Math Help - avg

  1. #1
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    avg

    A student has received scores of 88,82, and 84 on three quizzes. If tests count twice as much as quizzes, what is the lowest score the student can get on the next test to achieve an avg score of at least 70?

    thank you everyone,
    Judi
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  2. #2
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    Let x be the score for the test.

    \frac{88 + 84 + 82 + x + x}{5} \geq 70


    88 + 84 + 82 + 2x \geq 350

    There are 2 x's because tests count twice as much as quizzes.

    Do you understand?
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  3. #3
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    yes, I did the same thing except for dividing by 5, I did by 4. Why is it dividing by 5?
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  4. #4
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    The test is worth twice as much as each quiz. So 1/5 of the total score comes from each quiz (totaling 3/5 for 3 quizzes) and 2/5 comes from the test.
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