The answer is 2 and here is why. In order to find the interquartile range (also known as IQR). You must first order all the numbers from least to greatest and find the median, or middle number. In this case, the median is 44.5. Now that you have found the median, your data is split into two categories as follows:
43, 44, 44, 44 | 45, 45, 47, 48
Now you have to find the median of each group of numbers. The median for the first group is 44 and the mean for the second group is 46. Next, you subtract the two medians you just found and that's your answer.