The second quartile, also known as the middle quartile or median of a data set is equal to the 50th percentile of the data. The Q 1 separates the lowest 25% of data from the highest 75%. The first quartile also referred to as the lower quartile, is equal to the 25th percentile of the data. There is a total of three quartiles in a data set: 1. What is a quartile?Ī quartile is a type of quantile that has three points separated into four equivalent classes, each of which accounts for a fourth of the dispersed population. In this post, we will explain the quartile definition, how to find the first quartile and the lower quartiles, and the interquartile range.
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