However, the trimmed mean does not have a normal distribution even if the data are normally distributed. The interquartile range (IQR) is simply the difference ... Rousseeuw and Croux (1993) proposed ...

also divides the upper half of the data into two halves. The interquartile range is \(17 - 7 = 10\). (Sometimes we are asked for the semi-interquartile range . This is half of the interquartile ...