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4 September, 05:46

Ella's test grades in her history class are 89, 94, 82, 84, and 98. What score must Ella make on her next test to have a mean test score of 90?

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Answers (2)
  1. 4 September, 06:30
    0
    Mean is same as average

    to find average

    add up terms

    divided that sum by the number of terms you have

    example

    mean of x, y, z

    x+y+z

    3 terms

    (x+y+z) / 3=mean

    so

    represent next test score as x

    89+94+82+84+98+x

    count how many terms ther are (6 terms)

    mean is 90

    (89+94+82+84+98+x) / 6=90

    add the like terms

    (447+x) / 6=90

    multiply both sides by 6 to clear fraction

    447+x=540

    subtract 447 from both sides

    x=93

    she needs a score of 93 on next test
  2. 4 September, 06:40
    0
    She will have to get a 96 on here next test
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