book Maths Puzzle Numerical Ability

[2X-7][2X^2+3X-11]

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LIghthouse - Height(feet)
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Currituck - 162
Bodie Island - 165
Ocracoke - 65
Cape Hattress - 193
Cape Lookout -165

***What is the interquartile range? i have problems doing real numbers and fractions numbers can you please help me thank you