deltas:    3 3 5 6 3 6 4 9 10 3 3
sort:      3 3 3 3 3 4 5 6 6 9 10
partition: 3 3 3 3 3 4 | 5 6 6 | 9 10

mean:         3.166    |  5.66 | 9.5
divide:    3 3 3 3 3 4 | 2.8 3.3 3.3 | 9 10
update:    3 3 3 3 3 4 2.8 3.3 3.3 | 9 10
mean:             3.15 | 9 10

repeat...