The median of the given set (10, 14, 15, 17, 20, 21, 22, 25) is calculated by averaging the two middle numbers (17 and 20), resulting in a median of 18.5. Thus, the correct option is 3) 18.5.
The median of a set of data values is the middle value when the numbers are arranged in order. If the set has an even number of values, the median is the average of the two middle numbers. Looking at the data set 10, 14, 15, 17, 20, 21, 22, 25, we have an even number of values (8 in total), so we need to find the average of the two middle values, which are 17 and 20.
To find the median, you add 17 and 20 to get 37 and then divide by 2:
Median = (17 + 20) / 2 = 37 / 2 = 18.5
Therefore, the median of this data set is 18.5, which corresponds to option 3.
