A man pays 1 a throw to try to win a 3 Kewpie doll His proba

A man pays $1 a throw to try to win a $3 Kewpie doll. His probability of winning on each throw is 0.1.

(a) What is the probability that two throws will be required to win the doll?

(b) What is the probability that x throws will be required to win the doll?

(c) What is the probability that more than three throws will be required to win the doll?

(d) What is the expected number of throws needed to win a doll?

Solution