Jill knows her average score on five tests is 88. She can find all but one test. She has tests with scores of 96,83,100, and 79. What is the missing test?
88 * 5 = 440
Add the four scores and subtract from 440 to find the missing test score.
To find the missing test score, you need to determine the total of Jill’s scores for the five tests.
We know that her average score on the five tests is 88, so the sum of her scores must be 5 * 88 = 440.
You already have the scores for four tests which are 96, 83, 100, and 79.
To find the missing test score, subtract the sum of the known scores from the total sum:
440 - (96 + 83 + 100 + 79) = 440 - 358 = 82.
Therefore, the missing test score is 82.