Answer:
Explanation:
Mean is when you add all the numbers toghther and then you divide it by how many numbers there are so for example we would add 15 + 15+8+12+15+8+20+12+10+12 and we get 127 from there we divide it by 10 because there are 10 numbers and we get 12.7
Range is simple all you do is subtract the biggest number by the smallest number and you get 20 - 8 = 12. SO the range is 12
I hope this helps :)