For the following data set:
1, 2, 3, 4, 5
What percent of the numbers are even?
Figure 1.40% of the values are even.
Percentile |
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A percentile is a value below which a certain percentage of observations lie. |
For the following data set:
2, 2, 3, 4, 5, 5, 5, 6, 7, 8, 8, 8, 8, 8, 9, 9, 10, 11, 11, 12
What is the percentile< ranking of "10"?
Figure 2. |
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Now, what value exists at the percentile ranking of 25%?
Figure 3. |
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Here, it is saying that the 25% percentile exists somewhere between the 5th and 6th value. There is no "5.25th" value, so I take the average of the 5th and 6th values to find what value exists at the 25th percentile. 5 and 5 average to give us an answer of 5.
Quartile |
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Quartiles divide data sets into quarters. There are three quartiles: The 1st Quartile is located at the 25th percentile, the 2nd Quartile is located at the 50th percentile, and the 3rd Quartile is located at the 75th percentile. |
Figure 4. |
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