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info@snapandsolve.comUpper and Lower Quartiles:
The lower quartile (Q1) is at the 20th item (25% of 80), which corresponds to a discount of £15.
The upper quartile (Q3) is at the 60th item (75% of 80), which corresponds to a discount of £45.
Interquartile Range:
The interquartile range (IQR) is Q3 - Q1 = £45 - £15 = £30.
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