#Is the mark scheme wrong

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quick forge
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IQR of class A is 21

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IQR = Q3 - Q1 = 58 - 37 = 21

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, Q1 is the (15+1)/4 = 4th number which is 37

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4 × 3 = 12th number which is 58

warm crater
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Wait no!

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Ignore me

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I know what i did wrong

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I divided each quartile into thirds not quarters