Roulette Bet – 2
Betting only on red or black:
There are 18 red spaces on a roulette table with 38 total spaces. Dividing 18 by 38 yields a probability of landing on red or black is 47.37%.
This probability can be used in a binomial distribution and made into an approximate standard normal distribution.
If you spin the wheel 38 times, there is a 99% probability that the ball would land on red at least 10 times. There is an 83% probability that in 38 spins; the ball will land on red at least 15 times.
However, the break-even point is 19 spins, since the bet on red is 1:1, and the probability of 19 red spins in 38 is only 37%. This indicates the difficulty of winning by only betting on red or black.
The results occur because, as indicated by the 18 divided by 38 equals 47.37% figure, the ball will land on red or black less than half the time. t is very unlikely for anyone to spin much more than 18 red spins out of 38 spins.
