Statistics Practice
Solve chapter-level practice questions for Statistics with reveal-only solutions and quick revision support.
Practice Questions
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Q1.
Find the class mark of the interval 20-30.
Q2.
The frequencies of four classes are 3, 7, 5, and 5. Find the total number of observations.
Q3.
For class marks 10, 20, 30 with frequencies 2, 3, 5, find the mean.
Quick Q&A Before You Revise
How do I know whether to use mean, median, or mode?
Use mean for overall average, median for the middle position in ordered or grouped data, and mode when the question asks for the most common value or class.
Why is cumulative frequency important in this chapter?
Cumulative frequency helps locate the median class and is also used while drawing an ogive.
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