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How do you know where to plot on different frequency diagrams? watch

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    am I right in thinking for certain diagrams you plot on the mid value while for others you plot on the highest value in each interval?
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    Yeah so for cumulative frequency if the class was 20<n<30 with a frequency of 14 you would plot the 30 and 14 but with histograms and frequency polygons you plot the mid-point of the clases
 
 
 
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