Ask Question
16 February, 05:25

Mary earned scores of 88, 91, 75, and 72 on four science tests. Determine her score on the

fifth test if her average for the five tests was 81.

о.

o

o

o

+1
Answers (1)
  1. 16 February, 08:36
    0
    Mary's score on the fifth test was 79.

    Step-by-step explanation:

    Mary's 1st score = 88 Mary's 2nd score = 91 Mary's 3rd score = 75 Mary's 4th score = 72 Mary's 5th score = x Mary's average score for the five tests = 81

    Let's solve for x, this way:

    Mary's average score for the five tests = (Mary's 1st score + Mary's 2nd score + Mary's 3rd score + Mary's 4th score + Mary's 5th score) / 5

    Replacing with the values given:

    81 = (88 + 91 + 75 + 72 + x) / 5

    81 * 5 = 326 + x

    405 = 326 + x

    - x = 326 - 405

    x = 79
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Mary earned scores of 88, 91, 75, and 72 on four science tests. Determine her score on the fifth test if her average for the five tests was ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers