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Locate the 25% position using cumulative frequency
Use cumulative frequency and linear interpolation
IQR = Q_3 - Q_1
Your working, especially interpolation steps
IQR = 14.1 - 4.41 = 9.69 km
Q2 = 5 + ((60−34)/38)×5 ≈ 8.40 km
IQR = 14.1 − 4.41 = 9.69 km
Q1 ≈ 4.41 km (0 + (30/34)×5 ≈ 4.41)
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