What is the IQR of 4.5 5.5 6.5 6.5 7.5?

To find the interquartile range (IQR) of the data set 4.5, 5.5, 6.5, 6.5, 7.5, first, we determine the first quartile (Q1) and the third quartile (Q3). Q1 is the median of the first half (4.5, 5.5) which is 5.0, and Q3 is the median of the second half (6.5, 6.5, 7.5) which is 6.5. The IQR is then calculated as Q3 - Q1 = 6.5 - 5.0 = 1.5. Thus, the IQR is 1.5.