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Algebra

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The class average on a math test was 82 and there are 8 students in the class. If seven of the scores are 80, 90, 78, 100, 76, 74, and 82, what must the 8th score be to produce the average of 82?

  • Algebra -

    76

  • Algebra -

    ( 80 + 90 + 78 + 100 + 76 + 74 + 82 + x ) / 8 = 82 Multiply both sides by 8

    80 + 90 + 78 + 100 + 76 + 74 + 82 + x = 82 * 8

    580 + x = 656 Subtract 580 to both sides

    580 + x - 580 = 656 - 580

    x = 76

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