GraphModerate1 mark
7(ii)
Using a graph paper, draw an ogive for the following distribution which shows a record of weight in kilograms of 100 students. Use your ogive to estimate the following:
the weight above which 20% of the students lie.
Topic: Histogram / ogive / graphical representation
Previous-year question practice database
Answer
Solution diagram
Exam answer
20% of 100 = 20 students are above the required weight. Therefore 80 students are at or below it.
Read the x-value corresponding to c.f. 80 from the ogive.
Answer: Weight ≈ 63 kg.
Explanation
The value above which 20% lie is the 80th percentile. Read c.f. 80 from the ogive.
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