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The dot plot shows how many customers purchased different numbers of shirts at a sale last weekend.

The dot plot shows how many customers purchased different numbers of shirts at a sale-example-1

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The interquartile range IQR of a dataset is the difference between the upper and lower quartiles, Q3 and Q1

The median of the whole dataset is Q2 and corresponds to the value x=3.5

The value of Q1 is the median of the lower 3 values: Q1=2

The value of Q3 is the median of the upper 3 values: Q3=5

The IQR is: 5 - 2 = 3

User Jeremy Kauffman
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