Question: Roulette Marti decides to keep placing a $1 bet on number 15 in consecutive spins of a roulette wheel until she wins. On any spin, there's a 1-in-38 chance that the ball will land in the 15 slot.
(a) How many spins do you expect it to take until Marti wins? Justify your answer.
(b) Would you be surprised if Marti won in 3 or fewer spins? Compute an appropriate probability to support your answer.