For this and sibling comments, one way to think more intuitively is in terms of odds p(yes)/p(no). So going from 99% to 99.9% is 10 fold improvement in conversi

For this and sibling comments, one way to think more intuitively is in terms of odds p(yes)/p(no). So going from 99% to 99.9% is 10 fold improvement in conversion odds. That's why, for eg. "many 9s" of uptime is very hard.