Elaine's shopping expenses for the last six months were: $⁢150 , $⁢160 , $⁢155 , $⁢165 , $⁢155 , and $⁢160 What is the IQR of her shopping expenses?

Put the expenses in order: $150, $155, $155, $160, $160, and $165. The lower half has a median of $155 (Q1), and the upper half has a median of $160 (Q3). The IQR is Q3 − Q1 = $160 − $155 = $5, so the correct choice is 5 dollars.

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