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Range = largest value - smallest value of intervals.
Range = 65 - 45 = 20kg.
Q₁ position = n / 4.
Q₂ position = 120 / 2 = 60th value.
Q₃ position = 3n / 4.
Use linear interpolation in the relevant class.
IQR = Q₃ - Q₁.
IQR = 14 - 4.5 = 9.5km.
45 is included, 50 is not included.
It estimates values within class intervals accurately.
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