analog

If I remember correctly, it's because you can check more than one box. Each % denotes how many times that option was checked over the total number of votes- not checked boxes, but instances of voting. So if 4 people voted, it's showing what percentage of those 4 people chose each box. If they all chose box 1, box 1 would say 100% because 100% of those voting chose that box. If half of them also chose box 2 and the other half also chose box 3, 2 and 3 would each say 50% because half of all voters checked that box. See?

And since the last option has 3 people who ticked it, and it says 5% (at this moment), that means a total of 60 people voted.

Edit: I didn't realize it, but it tells you at the bottom of the poll how many total voters there were. My math was right, but I didn't realize it gave the number to us. lol