I don't know how reliable these numbers are, but according to Hoops Data, Rondo is shooting 47% from 16-23 feet this season. Only Carlos Arroyo has a better percentage among point guards playing more than 20 minutes a game.
Wow!
He also only takes them when he absolutely has to; if he took anywhere near as many shots from there as Arroyo does, his percentage would be much lower. Rondo is a far cry from making that jumpshot a part of his offense on which he can rely.
Arroyo takes 3.2 a game from that range, Rondo takes 2.9. Arroyo plays fewer minutes but still Rondo's close to the middle of the pack for point guards in terms of shots per game from that range.
Interesting. But given how much time each game Rondo spends handling the ball, he doesn't take very many jumpshots. Most point guards who spend almost the entire game handling the ball for their team (Nash, Felton, Paul, D. Williams, Rose, Westbrook etc) take many more jumpshots than Rondo does.
Arroyo, on the other hand, spends most of his time off the ball and usually catches and shoots when he does get the ball. So while Arroyo may not have many more attempts per game than Rondo, the percentage of his touches that result in him taking a jumpshot are much higher.