Compute At-least Probabilities
-You are playing roulette at a casino in the United States. The wheel has 18 red slots, 18 black slots, and two green slots. In 4 spins of the wheel what is the probability of at least one red?
A) $0.9048$
B) $0.9375$
C) $0.0625$
D) $0.0953$

Question

Quizplus · Accepted Answer

The probability of not hitting a red in one spin is $\frac{20}{38}$ (since there are 20 non-red slots out of 38 total slots). The probability of not hitting a red in 4 consecutive spins is $\left(\frac{20}{38}\right)^4$. Therefore, the probability of hitting at least one red in 4 spins is $1 - \left(\frac{20}{38}\right)^4 = 0.9048$.

Compute At-Least Probabilities -You Are Playing Roulette at a Casino 0.90480.90480.9048

Compute At-Least Probabilities
-You Are Playing Roulette at a Casino $0.9048$