问题求解,题目看起来简单,可是不明白具体意思。。。
Question 27
Twenty students take an exam. The percentages of questions they answer correctly are ranked from lowest to highest as follows:
32
| 49
| 57
| 58
| 61
| 62
| 64
| 66
| 67
| 67
| 68
| 69
| 71
| 72
| 72
| 74
| 76
| 80
| 82
| 83 | In a frequency distribution from 30% to 90% that is divided into six equal-sized intervals, the absolute frequency of the sixth interval is:
A) 2.
B) 4.
C) 1.
D) 3.
有个帖子给的答案是 D,我不明白,求解! |