## Definition of Quartile

A quartile is a statistic describing how a set of data points are divided into 4 groups. **Quartiles** split a set of data by using 3 points: the **lower quartile (Q1)**, **the median (Q2),** and **the upper quartile (Q3)**. Together with the minimum and maximum values, 3 quartiles split the data set into 4 equal groups:

**1**from the minimum to the lower quartile (Q1)^{st}group:**2**from Q1 up to the median (Q2)^{nd}group:**3**from the median (Q2) to the upper quartile (Q3)^{rd}group:**4**from Q3 to the maximum data point.^{th}Group:

## Rules and steps for finding Quartiles

### 1. Finding median (also called Q2, second quartile)

The median is the midpoint (or middle value) of a set of numbers. You can find the median by ordering the set of numbers and then finding the middle value in the set. The median is also called the 2^{nd} quartile or Q2.

### 2. Finding the lower quartile (also called Q1, first quartile)

**Step 1**: You can find the lower quartile by putting the set of data in order, then locating the median value.**Step 2:**After finding the median value, you can find the middle value between the minimum and the median.

### 3. Finding the upper quartile (also called Q3, third quartile)

**Step 1:**You can find the upper quartile by putting data points in order, then finding the median value.**Step 2:**After finding the median value, you can find the middle value between the median and the maximum.

Finally, you will get 3 quartile values, 77 (lower quartile, Q1), 81 (median, Q2), and 89 (upper quartile, Q3).