Same chapter3 marksDifficulty: Medium
Explain the term cumulative frequency and state how the cumulative frequency of a class is obtained.
Graphical Representation
3 marksDifficulty: Medium
The marks of 40 students are grouped into class intervals of width 10. Explain how the modal class is identified from a histogram of the data.
Original Khojo Papers practice question — not from a past board paper.
Answer
The modal class is the class whose bar is tallest, because with equal class widths the tallest bar has the greatest frequency.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
If the class widths were unequal the frequencies would first have to be converted to frequency densities, since in a histogram it is area, not height, that represents frequency.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Why must class intervals be converted to their exclusive form before a histogram is drawn?
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State two differences between a bar graph and a histogram.
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Same chapter3 marksDifficulty: Medium
What is an ogive, and what is read from the point where the two ogives of a distribution intersect?
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Same chapter4 marksDifficulty: Medium
A less-than ogive is drawn for 60 observations. Explain how the median, the lower quartile and the upper quartile are read from it.
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Same chapter4 marksDifficulty: Medium
For a distribution of 80 observations, state the cumulative frequencies at which the median, the lower quartile, the upper quartile and the 60th percentile are read from a less-than ogive.
Graphical Representation