The average score of 5 tests is 61. The first 4 scores are 78, 55, 54, 89. What is the last score?
Answer and explanation
Correct answer: A. 29
- Step 1: Total of all scores .
- Step 2: Last score .
Answer
29.
Why not the others: 61: it assumes the last score equals the average. 69: it uses the mean of the known scores.
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