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  • Brainly User
2016-02-27T22:07:04+08:00

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Arrange the scores in ascending order:

     13, 15, 20, 21, 23, 25, 27, 33, 34, 36

25% = 1/4

Solution:

25th percentile = 1/4 (10)
                         =  10/4
                         = 2.5  or  3

The 25th percentile is 20 (third from right).

Therefore, the scores equal or less than 25% of the data are 12, 15, and 20.
                          
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