Unfortunately it wouldn't be entirely accurate as a d10 to spread across all possible outcomes since the instance rate of E alone is 12% (see below).
But, if you have a system that measures success/fail over a specific number then you could average it out overall -- in a 6-or-better instance spread 50% across 1-5, the other 50% across 6-10.
Quick version below. You could break this into numbers but E will always throw it off.
I wonder if you could tweak it such that E was roll again. Thanks for the data and the detailed response!
Not a bad suggestion for a "roll again." Gets you closer to a d10, though instance of T is just over 10% if E is taken out of the equation. But it's MUCH closer (see below).
And happy to help - I've been mulling over a d10 for a while so thank YOU for the "roll again" suggestion. Looking better.
Wow! That's definitely close enough for casual use. The T rounds down to 10%, at least.
Ship it? :)
