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Rank them from highest to lowest. The lowest 25 percent of them represent the bottom quartile. Let's say you have the following data set: 1, 8, 2, 7, 3, 6, 4, 5 Rank them thus: 1, 2, 3, 4, 5, 6, 7, 8 Twenty-five percent of eight (the number of data points) is two. Therefore, the bottom two data points (1 and 2) represent the bottom quartile.

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Q: How do you determine the lowest quartile of a series of numbers?
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