WebJan 25, 2024 · The interquartile range (IQR) is the difference between the first quartile and third quartile. The formula for this is: IQR = Q 3 - Q 1. There are many measurements of the variability of a set of data. Both the range and standard deviation tell us how spread out our data is. The problem with these descriptive statistics is that they are quite ... WebApr 5, 2024 · The IQR is the difference between these two values. That is, 54 - 31, or, 23. This method of breaking the groups in half, finding the middle number and repeating this for each half works perfectly with a collection of 15 ages. But we can still work out the interquartile range if we had an even number of ages and couldn’t find middle values.
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