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INTRODUCTION & DEFINATION OF QUARTILES

**QUARTILES –**

**The
observations which divide the whole set of observations into four equal parts,
are known as quartiles.**

**Lower
Quartile (on First Quartile) -**

**If the
variates are arranged in ascending order, then the observation lying midway
between the lower extreme and the median is called the lower quartile, or First quartile, to be denoted by Q₁.**

**Upper
Quartile (or Third Quartile) -**

**If the
variates are arranged in ascending order, then the observation lying midway
between the median and the upper extreme is called the Upper Quartile or Third
Quartile, to be denoted by Q₃**

**Middle
Quartile –**

**The middle
quartile is the median, denoted by Q₂.**

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