To find the median of the data, we first need to arrange the weights in ascending order:
13, 14, 17, 22, 25, 28, 33, 37, 37, 40, 41, 42, 61
Since there are 13 data points, the middle value will be the median. In this case, the median is 33, which represents the weight that separates the lower half and the upper half of the data set.