37
After 250 rolls I can honestly say this D20 is the worst of the 17 I tested
(files.catbox.moe)
Out of 250 rolls 27 were 1's. A roughly 11% chance of rolling a 1 on this die.
For those curious about the rest:
Here's the stats for all 17
Yeah, that is odd. I tried to edit the comment and it shows http.