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The first three test scores of each of the four students are shown. each test is 100 points. each student hopes to maintain a mean score of 85. find the score needed by each student on the fourth test to have a mean score of 85, or explain why such value is not possible. a. lisa: 78, 80, 100 b. mary: 90, 92, 95 c. lina: 79, 80, 81d. willie: 65, 80, 80

Answers

  • Réponse publiée par: stacy05
    SOLUTION:

    (85 × 4) - (100 × 3)

    340 - 300

    40

    CHECK:

    [(100 × 3) + 40] ÷ 4 = 85

    [300 + 40] ÷ 4 = 85

    340 ÷ 4 = 85

    85 = 85

    TRUE

    ANSWER: 40
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The first three test scores of each of the four students are shown. each test is 100 points. each st...