In Lotto under the 6/52 · Jan 2010 – Oct 2012 rules — 442 draws, 6 from 1–52 (an earlier era).
44times drawn · chance expected 51 −1.04σ
9draws waiting · a wait this long: 38% for any number
10.0average wait between appearances · chance says 8.7
36longest completed wait · 45% chance of one at least that long
15 is drawn as often as chance explains
Drawn 44 times in 442 draws against 51.0 expected, −1.04σ. Each draw is independent: after 9 draws away it is exactly as likely tonight as a number drawn yesterday.
15
Number 15, draw by draw
Drawn 44 times in 442 draws · average wait 10.0 draws · longest completed wait 36 · waiting 9 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 15 has a favourite seat — chance gives a small number the low positions more often. That is the shape of sorting, not of the machine.
It has shared a draw with every one of the other 51 numbers; chance expected about 0.7 still unmet by now. Every pair →
How many people play it
Under the crowd model, 15 is picked about 1.22× as often as an indifferent choice — 15th most popular of 52. 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: 15 is drawn with probability 6/52 tonight whatever it did last week.