Find Lower Quartile Of Numbers. Order your data set from lowest to highest values. Find the median of the data set and label it as Q2.
As on the previous page the median is 12. The formula for quartiles is given by. Interquartile Range Q3 Q1.
To get Q1 you need 25 of the data to the left and 75 to the right Step 2.
Data 2 4 5 5 8 8 9. As on the previous page the median is 12. Find the first and third quartiles of the data set 3 7 8 5 12 14 21 13 18. Jul 26 2010 Example 1.
