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Statistics and Probability
Quick questions on Cumulative frequency and quartiles explained: O-Level E-Maths
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is cumulative frequency?Show answer
Cumulative frequency is a running total of the frequencies, the number of values up to and including the upper boundary of each class. You build it by adding each class frequency to the sum of all the earlier ones, so the final cumulative frequency equals the total number of values.
What is the cumulative frequency curve?Show answer
Plot the cumulative frequency against the upper class boundary and join the points with a smooth curve. The result is an S-shaped (ogive) curve that rises from zero to the total frequency, and reading across and down from it estimates positions in the data.
What is q1?Show answer
State the cumulative frequency position for the median of values. [1 mark]
What is q2?Show answer
The lower quartile is and the upper quartile is . Find the interquartile range. [1 mark]
What is q3?Show answer
For values, state the position used to read the upper quartile. [1 mark]
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