Find first quartile for variable with observations 15, 4, 7, 20, 2, 7, – InterviewSolution

1.

Find first quartile for variable with observations 15, 4, 7, 20, 2, 7, 13.

Answer»

Arranging the observations in ascending order: 2, 4, 7, 7, 13, 15, 20 , Here, n = 7.

First quartile Q₁ = Value of \((\frac{n+1}{4})\)th observation

= Value of \((\frac{7+1}{4})\)

= 2nd observation

∴ Q₁ = 4.

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