In Oz Lotto under the 7/47 + 3/47 · since May 2022 rules — 230 draws, 7 from 1–47.
31times drawn · chance expected 34 −0.60σ
15draws waiting · a wait this long: 10% for any number
6.9average wait between appearances · chance says 6.7
17longest completed wait · 91% chance of one at least that long
31 is drawn as often as chance explains
Drawn 31 times in 230 draws against 34.3 expected, −0.60σ. Each draw is independent: after 15 draws away it is exactly as likely tonight as a number drawn yesterday. It has also come out as the bonus ball 16 times, counted separately.
31
Number 31, draw by draw
Drawn 31 times in 230 draws · average wait 6.9 draws · longest completed wait 17 · waiting 15 draws now
a completed wait — darker is longer the wait still running — a lower bound, not a finished gap
Where it lands in a sorted draw
Sort a draw and 31 has a favourite seat — chance gives a large number the high positions more often. That is the shape of sorting, not of the machine.
Never drawn alongside 1 of the other 46 numbers; chance expects about 0.8 such strangers by now. Every pair →
How many people play it
Under the crowd model, 31 is picked about 1.22× as often as an indifferent choice — 15th most popular of 47. That changes nothing about whether it comes up, and everything about how many ways a jackpot on it would be shared.
Nothing here predicts the next draw. A number’s history is a record of a fair machine’s past, and the machine keeps none of it: 31 is drawn with probability 7/47 tonight whatever it did last week.