Quartiles
Definition of Quartiles
More about Quartiles

A data set has three quartiles: the lower quartile, the median of the data set, and the upper quartile.

Median: The median divides a data set into two equal parts.

Lower quartile: Median of the lower half of the data.

Upper quartile: Median of the upper half of the data.
Examples of Quartiles
 The owner of a super market recorded the number of customers who came into his store each hour in a day. The results were 12, 8, 10, 7, 15, 3, 6, 7, 12, 8, and 9.
The ascending order of the data is 3, 6, 7, 7, 8, 8, 9, 10, 12, 12, 15.
The lower quartile is 7, the median is 8, and the upper quartile is 12.
Solved Example on Quartiles
What is the product of all the three quartiles of the boxandwhisker plot shown?
Choices:
A. 2,050
B. 2,431
C. 1,234
D. 41
Correct Answer: B
Solution:
Step 1: The middle quartile = 13 and the upper quartile = 17.
Step 2: The product of all the three quartiles = lower quartile ´ middle quartile ´ upper quartile = 11 ´ 13 ´ 17 = 2,431 [Multiply.]
Related Terms for Quartiles
 Lower Quartile
 Median
 Upper Quartile
Additional Links for Quartiles