peer review comments
Changing to use average value rather than sum.
Change-Id: I7f97e27c4f463fe60bec2cbc52f3eac66d8fa77f
Former-commit-id: 4e15f63b4e [formerly c49759d28e] [formerly f000c1a9cf [formerly f15ba1ee009abf4a562bb37450d65f97c7ffa217]]
Former-commit-id: f000c1a9cf
Former-commit-id: 56cd5da64d