design/ezwebin/templates/content/collectedinfo/poll.tpl:57

{set $percentage = cond( $total_count|gt( 0 ), round( div( mul( $item_count, 100 ),$total_count ) ), 0 )}

With this

{set $percentage = cond( $total_count|gt( 0 ), div( mul( $item_count, 100 ), $total_count ), 0 )}

Steps to reproduce

Create a Poll with a yes/no question
1) Select that object
2) Answer 5 times "yes" to the binary question
3) Anwser 3 times "no" to the binary question
4) View the stats, and check the percentage of "yes" and "no"

Expected results:
62,5% of "yes" and 37,5% "no" => 100%.

Actual results
63% of "yes" and 38% "no" => 101%.