for the mean, add everything then divide the value by the number of the given numbers for the median, get the mid number. since the numbers presented are 9 numbers we just have to find the 5th number. in some cases that the middle value is 2 numbers just add and divide the sum by 2for the mode, it's the number that appears the most out of any number or is repeated again and again for the range, just subtract the highest value to the lowest so 13-2