How would a cumulative frequency graph be plotted for this?

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jojo55
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Hi there. Can a cumulative frequency graph be plotted for the attached stem and leaf?

Would the x-axis be 'test scores'? Then I plot, 7, 25 (as 7 + 15), 43 (25 +18), ......and so on?

Would I have the y-axis as 'number of employees'?.

It just seems a bit weird as it is discrete data that I am using.

Pls help .
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ghostwalker
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(Original post by jojo55)
Hi there. Can a cumulative frequency graph be plotted for the attached stem and leaf?

Would the x-axis be 'test scores'? Then I plot, 7, 25 (as 7 + 15), 43 (25 +18), ......and so on?

Would I have the y-axis as 'number of employees'?.

It just seems a bit weird as it is discrete data that I am using.

Pls help .
Yes, your x-axis will be "test score", but your y-axis is "cumulative number of employees".

To start, your graph will be zero up to, but not including x=7, then 1 from x=7 (inclusive) to x=18 (excluded) the next lowest test score. Etc. Each time the graph will increase when x reaches a value the employees actaully scored and the increase will be by the number of employees that have that score.

I can't work out your thinking process for the 25 - where does the 15 comes from? Similarly for the 43 - where does the 18 comes from?
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CraigFowler
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I would personally answer it the following way:-

Do table of Test Score (with class widths of 5), ie test score 0-5; 6-10; 11-15 etc
Write next to this the frequency that this score was achieved, from the raw stem and leaf data.
Then another column for cumulative frequency then plot. test score on x axis against cumulative frequency. Remember to plot test score with the upper class boundary, e.g. 5.5, 10.5 etc.
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