AMC 8 2025 Problem 7
AMC8 2025 年第 7 题
统计与数据图表★★☆☆☆
On the most recent exam on Prof. Xochi's class,
5 students earned a score of at least 95% ,
13 students earned a score of at least 90% ,
27 students earned a score of at least 85% ,
50 students earned a score of at least 80% ,
How many students earned a score of at least 80% and less than 90% ?
在Xochi教授班上最近的一次考试中，
5名学生的得分率至少达到了95%， 13名学生的得分率至少达到了90%， 27名学生的得分率至少达到了85%， 50名学生的得分率至少达到了80%。
请问有多少名学生的得分率至少达到了80%，但小于90%？
- A.8
- B.14
- C.22
- D.37
- E.45
正确答案 · Correct Answer
D
解析 · Solution
Solution 1
50 people scored at least 80%, and out of these 50 people, 13 of them earned a score that was not less than 90%, so the number of people that scored in between at least 80% and less than 90% is .
Let denote the number of people who had a score of at least 85, but less than 90, and let denote the number of people who had a score of at least 80 but less than 85. Our answer is equal to a+b. We find a = 27 - 13 = 14, while b = 50 - 27 = 23. Thus, the answer is . -vockey
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