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The inter-quartile range of the observations 3, 5, 9, 11, 13, 18, 23, 25, 32 and 39 is
A. 24
B. 17
C. 31
D. 8

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Correct Answer - B
Inter-quartile range `= (Q_(3) - Q_(1))/(2)`
`Q_(3) = (3(n + 1))/(4)` th observation
`Q_(1) = ((n + 1))/(4)`th observation.

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