Mean: (2 + 4 + 4 + 2) / 4 = 3
Median: Since there is an even number of values, the median is the average of the two middle values. In this case, the two middle values are 4 and 4, so the median is (4 + 4) / 2 = 4.
Spread: The range is the difference between the highest and lowest values, which is 4 - 2 = 2.