Lets p = salesman's commission as percent
15,200 * p = 912
p = 912/ 15,200
p = 0.06
p = 6%
answer
6%
170^3 this is the answer just make sure you do you're work.
1 and 3 they share a relationship of +2, 3 and 6 share x2, 5 and 8 share +3, 7 and 21 share x3
The standard deviation of the set is 5.2
To find standard deviation, we take the square root of the variance.