The Interquartile range is 227.
This is defined as the difference between the 75th and 25th percentiles of the data and can be calculated by Q3 - Q1.
In this case, the data are arranged in an ascending or descending order and the median (middle value) of the lower and upper half of the data are quartile 1 (Q1) and quartile 3 (Q3) respectively.
147,150,180,189,210,320,375,407,429,580
407-180 = 227
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