A: Sixty-six point six percent. With the six repeating obviously.
If you played baseball and hit the ball four times out of six, you'd be the Best Ballplayer Ever, better than Ruth and Cobb and Williams combined.
If you played basketball and made four out of every six shots, you'd be an Excellent Ballplayer, one of the best ever. A guaranteed Hall of Famer.
If you played quarterback in the NFL and completed four out of every six shots, you would be a Great Ballplayer with a long career and many trips to the Pro Bowl.
4 out of 6 for most any athlete translates to a long, successful career.
But you are not an athlete. You are an obstetrician. Delivering four out of six babies without dropping them makes you a Terrible Baby Doctor.