Does anybody now mean, mode, range, ext? asap need !

The "mean" is the "average" you're used to, where you add up all the numbers and then divide by the number of numbers.
- (13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13) ÷ 9 = 15The "median" is the "middle" value in the list of numbers.
- 13, 13, 13, 13, 14, 14, 16, 18, 21...
So the median would be 14.The "mode" is the value that occurs most often. If no number is repeated, then there is no mode for the list.
- So the mode would be 13 
The "range" is just the difference between the largest and smallest values.
-    21-13= 8

I hope this helps you.