The answer is b) center
This is because the mean is calculated by the sum of all the numbers and then dividing it by the number or numbers there were to calculate the average. To calculate the median you put the numbers from greatest to least and find the number in the middle. If there are two you add them and divide by 3. They are both used to find centers of measured but in some cases the mean might be a better way to calculate the center than the median and vice versa, so the answer is B
