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Given data, how to find the 3rd quartile

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The following data represents the processing times required to pack 20 randomly selected computer hardware orders for mailing:

5.62 16.25 11.46 8.45 5.41 11.62 7.5 4.42 7.58 7.54

5.29 10.92 21.62 8.58 11.42 7.29 7.96 10.5 9.29 8.92

What is the third quartile?

A. 10.92
B. 11.05
C. 11.42
D. 11.46

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Solution Summary

A step-by-step solution is provided. It is shown how to find the 3rd quartile (Q3), given a data set. A definition of the 3rd quartile is presented. An example using 20 data points is used to illustrate.

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To find the third quartile, we first need to order the data in ascending order as follows

4.42
5.29
5.41
5.62
7.29
7.5
7.54
7.58
7.96
8.45
8.58
8.92
9.29
10.5
10.92
11.42
11.46
11.62
16.25
21.62

The third quartile is defined as the 75th percentile of ...

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