Question

If the Q1 = 20 and Q3 = 50 , the quartile deviation is :​

Answer 1

The quartile deviation = 15

Given :

Q₁ = 20 and third quartile Q₃ = 50

To find :

The quartile deviation

Solution :

Step 1 of 2 :

Write down the given quartile

By the given

First quartile = Q₁ = 20

Third quartile = Q₃ = 50

Step 2 of 2 :

Find quartile deviation

The quartile deviation

$\displaystyle \sf{ = \frac{Q_3 -Q_1 }{2} }$

$\displaystyle \sf{ = \frac{50 - 20 }{2} }$

$\displaystyle \sf{ = \frac{30}{2} }$

$\displaystyle \sf{ = 15 }$

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