1990 AMC 8 Problem 9
Attempt Problem 9 of the 1990 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1990 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
9.
The grading scale shown is used at Jones Junior High. The fifteen scores in Mr. Freeman’s class were:
| A | |
| B | |
| C | |
| D | |
| F |
In Mr. Freeman’s class, what percent of the students received a grade of C?
Answer: D
Small hint:
Count how many scores fall in the range
Big hint:
Divide that count by the students to get the fraction, then convert to a percent
Solution:
A grade of C corresponds to scores from to . The qualifying scores are , which is students.
So the percent is
Thus, the correct answer is D .
Problem 9 in other years
- 1985 AMC 8
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