Question

某数学班上一评分阶段的成绩如下： $5$ 名学生得 A， $4$ 名得 B， $3$ 名得 C， $3$ 名得 D， $5$ 名得 F。如果 A、B、C、D 都是及格成绩，那么及格成绩占全部成绩的几分之几？

The grades in a mathematics class for the last grading period were: $5$ students earned an A, $4$ earned a B, $3$ earned a C, $3$ earned a D, and $5$ earned an F. If A, B, C, and D are satisfactory grades, what fraction of the grades are satisfactory?

$\dfrac{1}{2}$

$\dfrac{2}{3}$

$\dfrac{3}{4}$

$\dfrac{4}{5}$

$\dfrac{9}{10}$

答案：C

知识点：数据与图表解读分数

难度评级：660

解答：

及格成绩共有 $5 + 4 + 3 + 3 = 15$ 个，总成绩数是 $15 + 5 = 20$ 。

所以及格成绩所占的分数是 $\dfrac{15}{20} = \dfrac{3}{4}$ 。

所以正确答案是 C。

The satisfactory grades number $5 + 4 + 3 + 3 = 15,$ and the total number of grades is $15 + 5 = 20.$

So the fraction that is satisfactory is $\dfrac{15}{20} = \dfrac{3}{4}.$

Thus, the correct answer is C .

1985 AMC 8 第 5 题

答案：C

难度评级：660

解答：

其他年份的第 5 题