Calculate the interquartile range of the data ... plot from a cumulative frequency Drawing a box plot from a cumulative frequency graph is straightforward as long as the median and quartiles ...
A cumulative frequency ... find the upper quartile, use \(\frac{3}{4}\) instead. \(\frac{3}{4}\) of 40 = 30. Read across at 30 and down. The upper quartile is about 47 cm. The interquartile range ...
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