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0 10 20 30 40 50 60 70 80 90 100 Marks out of 100 Mrs Smith’s Class Median Lower Quartile Upper Quartile Minimum Maximum

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0 10 20 30 40 50 60 70 80 90 100 Marks out of 100 Mr Jones’ Class Mrs Smith’s Class Median Lower Quartile Upper Quartile MinimumMaximum

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Box and Whisker Diagrams 0 10 20 30 40 50 60 70 80 90 100 Marks out of 100 Mr Jones’ Class Mrs Smith’s Class Although the medians of the two classes are very close, Mrs Smiths class have a much greater spread of marks. The range for Mrs Smith’s class is 100 compared to only 80 for Mr Jones’ class. Also, the interquartile range for Mr Jones’ class is much smaller; only 13 compared with 24. On the whole, Mr Jones’ class marks were more tightly grouped around the median mark.

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