>attributed to Edison

me too.

more fun with percents:

95% of this game is half mental.
-- Yogi Berra

98% of the adults in this country are decent, hardworking, honest
Americans. It's the other lousy 2% that get all the publicity. But then,
we elected them.
-- Lily Tomlin

and of course, the progenitor of Sturgeon's Law, paraphrased from Sturgeon's Revelation:

90% of science fiction is crud, but then 90% of everything is crud.