Same chapter3 marksDifficulty: Medium
Explain the term cumulative frequency and state how the cumulative frequency of a class is obtained.
Graphical Representation
4 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.
Original Khojo Papers practice question — not from a past board paper.
Answer
The median is read at a cumulative frequency of 30, the lower quartile at 15 and the upper quartile at 45. In each case draw a horizontal line at that cumulative frequency to meet the curve, then drop a vertical line to the x-axis and read the value.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The quartiles are at n/4, n/2 and 3n/4 of the total frequency.
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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