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The inter-quartile range is the range of the box.

20 - 17
3

Hope this helps!
Answer: The IQR is 3

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Explanation:

The left edge of the box is at 17. This is the first quartile, so Q1 = 17
The right edge of the box is at 20. This is Q3 = 20 (third quartile)

Subtract the quartile values to get the inter-quartile range (IQR)
IQR = Q3 - Q1
IQR = 20 - 17
IQR = 3

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