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2. It should extend across the full dataset
3. It does not need to coincide exactly with any of the points but there should be a
roughly even distribution of points either side of the line over its entire length.
5 Cumulative Frequency Diagrams
As discussed above, cumulative frequency is obtained by adding each of the
frequencies. When asked to calculate the median you have to do:
1. See the maximum value on the y-axis and take its half on the y-axis and then
draw a line from that point connecting it with the graph
2. Next check the x-axis to see the point at which at that point of intersection lies -
that’s your answer.
For lower quartile, which means 25%, follow the same process but this time find
the mid value between 0 and the median. Similarly, for upper quartile, which
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