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A quartile divides a grouping into four. The first quartile will have the first 25% of the group, the second quartile will have the second 25% of the group, the third quartile will have the third 25% of the group and the last quartile will have the last 25% of the group. For example if a classroom had 20 students who had all taken a test, you could line them up, the top 5 marks would be in the first quartile, the next five would be in the second quartile, the next 5 would be in the third quartile, and the 5 students with the lowest marks would be in the last quartile. Similarly, a percentile divides a grouping, except the group is divided into 100. Each 1% represent 1 percentile.
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What does interquartile mean in math?
If a set of data are ordered by size, then the lower quartile is a value such that a quarter of the data are smaller than it. The upper quartile is a value such that a quarter of the data are larger than it. Interquartile means between the quartiles.
Which represents better performance or if they stayed the same the third quartile and 70th percentile?
3rd quartile = 75th percentile and so is "better".
What is the name for the difference for the difference between the third quartile and first quartile in a five- number summary?
Interquartile range.
How is interquartile range calculated?
Find the difference between the values for quartile 3 and quartile 1.
Which measure is always the same as the 25th percentile?
lower quartile
