Generally, we have three quartiles.
These are the first quartile represented as Q1
Second quartile represented as Q2 which is also the median
Third quartile represented as Q3
To calculate the value of the quartiles, we need to rearrange the dataset in ascending order.
By rearranging , we have ;
2,5,6,8,10,11, 15,15,16,17,20,25
To calculate the first quartile Q1, we need to split the data into 4 different parts
Mathematically, the term which is the first quartile can be identified using the equation