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If Q1 = 5, Q2 = 10, and Q3 = 20, the quartile deviation will be:
Question

If Q1 = 5, Q2 = 10, and Q3 = 20, the quartile deviation will be:

A.

15

B.

25

C.

7.5

D.

30

Correct option is C


Quartile deviation = (Q3 - Q1) / 2 = (20 - 5) / 2 = 7.5.

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