AMC 8 1990 Problem 9

AMC8 1990 年第 9 题

统计与数据图表★★☆☆☆

The grading scale shown is used at Jones Junior High. The fifteen scores in Mr. Freeman's class were: 89, 72, 54, 97, 77, 92, 85, 74, 75, 63, 84, 65, 76, 64, 67. In Mr. Freeman's class, what percent of the students received a grade of

C

Jones 初中使用的评分标准如图所示。Mr. Freeman 班上的十五个成绩为：89, 72, 54, 97, 77, 92, 85, 74, 75, 63, 84, 65, 76, 64, 67。Mr. Freeman 班上获得

C

成绩的学生占百分之多少？

A.20%
B.25%
C.30%
D. $\displaystyle 33\frac{1}{3}\%$
E.40%

正确答案 · Correct Answer

解析 · Solution

Solution 1

Of the 15 students in Mr. Freeman's class, 5 students (those with scores of 77, 75, 84, 78, and 80 ) received a grade of C. So

\displaystyle \frac{5}{15} = 33\frac{1}{3}\%

of his students received a grade of C.

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