Consider the following set of numbers: 7, 13, 3, 5, 11, 4, 2. Calculate the median of this data set.

Step 1 ：Step 1: First, we need to arrange the numbers in ascending order: \(2, 3, 4, 5, 7, 11, 13\)

Step 2 ：Step 2: Since the number of observations is odd, the median is the middle value. There are 7 numbers and the fourth number will be the median.

Step 3 ：Step 3: Therefore, the median of this data set is 5.