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Cumulative Frequency (language ("cumulative"/"…

- - - - position of median = max. cumulative frequency / 2
        
        misconception: treating the position of the median as the median (e.g. if cumulative frequency is 50, median is 25)
        
        misconception: median position on x-axis & median value on y-axis
        
        misconception: using the max. number on the y-axis rather than the max. cumulative frequency plotted
      - to find the top/bottom 50%
    - - IQR = Q3 - Q1
        
        to find the middle 50%
      - position of Q1 = max. cumulative frequency / 4
      - position of Q3 = (max. cumulative frequency / 4) 3 = 3/4 max. cumulative frequency
    - - first need to find this percentage of the max. cumulative frequency