What’s is the mean of the following data set -5000,-4999,-4998,1,0,1,49998,4999, 5000

Add all numbers, and divide by the amount of numbers there are to find mean:

(-5000 - 4999 - 4997 + 1 + 0 + 1 + 49998 + 4999 + 5000)/9

45003/9 = 5000.33

5000.33 is your mean

hope this helps

No a triangle cannot be formed because when you add the two smallest number together (which would be 11) the have to be bigger than the number it is "against" ( which would be 12)