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Measures of central tendency — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsMeasures of central tendency1 Mark
Question
Find first quartile for variable with observations $15, 4, 7, 20, 2, 7, 13.$
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Answer

Arranging the observations in ascending order $: 2, 4, 7, 7, 13, 15, 20$
Here. $N = 7.$
First quartile $Q _1=$ Value of $\left(\frac{n+1}{4}\right)$ th observation $=$ Value of $\left(\frac{7+1}{4}\right)=2$ nd observation
$Q_1=4$

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