Same chapter3 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.
Graphical Representation
3 marksDifficulty: Medium
What is the inter-quartile range and how is it found from an ogive?
Original Khojo Papers practice question — not from a past board paper.
Answer
The inter-quartile range is the difference between the upper quartile and the lower quartile. From an ogive both quartiles are read off at cumulative frequencies 3n/4 and n/4, and the smaller is subtracted from the larger.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
It measures the spread of the middle half of the data and is not affected by extreme values.
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?
Graphical Representation
Same chapter3 marksDifficulty: Medium
State two differences between a bar graph and a histogram.
Graphical Representation
Same chapter3 marksDifficulty: Medium
What is an ogive, and what is read from the point where the two ogives of a distribution intersect?
Graphical Representation
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.
Graphical Representation
Same chapter3 marksDifficulty: Medium
Explain the term cumulative frequency and state how the cumulative frequency of a class is obtained.
Graphical Representation