Sure!
So your values are: 12, 4, -2, 0, 9, -2, 1, 7, 8, 2.
To find the mean, we have to add all these values together, and then divide that value by the amount of values we have. (12 + 4 - 2 + 0 + 9 - 2 + 1 + 7 + 8 + 2 = 39. 39 ÷ 10 (you have 10 values) = 3.9. The mean is 3.9)
To find the range, we find the lowest value and the highest value, and find the difference. The lowest value you have is -2. The largest is 12. The difference between 12 and -2 is 14. Therefore, the range is 14.
To find the median, we have to sort the list of values in ascending order, and find the middle value. -2, -2, 0, 1, 2, 4, 7, 8, 9, 12. Now we have to find the middle value. Because it is an even number, we have two middle numbers, so we have to take those 2 numbers and add them, and then divide them by 2. (Sort of like finding the mean again.) So: (2 + 4) ÷ 2 = 3. The median value is 3.
