QuestionJAMBGeneral Maths1987ObjectiveDispersion & cumulative frequencyDispersion & cumulative frequency
The scores of a group of students in a music test are shown. If CF(x) is the number of students with scores less than or equal to x, find CF(6).
| Score |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
| No. of students |
3 |
6 |
10 |
8 |
6 |
5 |
2 |
4 |
12 |
Worked solution (try it first)
CF(6) counts every student who scored 6 or less, so add the numbers for scores 1 to 6.
3+6+10+8+6+5=38, so
CF(6)=38, option B.
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