The average score of 5 tests is 63. The first 4 scores are 78, 68, 60, 59. What is the last score?
Answer and explanation
Correct answer: C. 50
- Step 1: Total of all scores .
- Step 2: Last score .
Answer
50.
Why not the others: 63: it assumes the last score equals the average. 66: it uses the mean of the known scores.
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