AMC 8 1986 Problem 12

AMC8 1986 年第 12 题

统计与数据图表★★★☆☆

Problem The table below displays the grade distribution of the 30 students in a mathematics class on the last two tests. For example, exactly one student received a 'D' on Test 1 and a 'C' on Test 2 (see circled entry). What percent of the students received the same grade on both tests?

下表显示了一个数学班 30 名学生最近两次考试的成绩分布。例如，恰好有一名学生考试一得了 'D'，考试二得了 'C'（见圈出的条目）。两次考试得分相同的学生占百分之多少？

AMC 8 1986 Problem 12 figure

A.12%
B.25%
C. $\displaystyle 33\frac{1}{3}\%$
D.40%
E.50%

正确答案 · Correct Answer

D

解析 · Solution

解析整理中

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