-- your search
| streamstats count as row
| eventstats sum(percent) as total by row
| eval percent=round(total/mvcount(percent),2)
| fields - row total
How do you want to "group" them? Add them together, multiply them together, take an average, join them with a space/comma between?
Sorry, I want to average them.
-- your search
| streamstats count as row
| eventstats sum(percent) as total by row
| eval percent=round(total/mvcount(percent),2)
| fields - row total