ISEE Word Problems Question 222: Answer and Explanation
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Question: 222
2. David was trying to determine the mean of his test scores. He did not know what he had scored on each of his final 3 tests but knew that the sum of the final 3 scores was 278. If David scored an 82 on his first test, then what was the mean of all 4 scores?
- A. 69.50
- B. 72.00
- C. 90.00
- D. 92.66
Correct Answer: C
Explanation:
The answer is C
To calculate the mean of all 4 scores, add the scores and divide by the number of scores: 278 + 82 = 360, and 360 รท 4 = 90.