Question 28,

Find the indicated probabilities using the geometricdistribution, the Poissondistribution, or the binomial distribution. Then determine if the events are unusual. Ifconvenient, use the appropriate probability table or technology to find the probabilities.

Assume the probability that you will make a sale on any given telephone call is 0.17. Find the probability that you(a) make your first sale on the fifthcall, (b) make your sale on thefirst, second, or thirdcall, and(c) do not make a sale on the first three calls.

(a) P(make your first sale on the fifth call)=

(Round to three decimal places asneeded.)

Question 26

Given that x has a Poisson distribution with =3, what is the probability that x=4?

P(4)

(Round to four decimal places asneeded.)

Question 25

Assume the geometric distribution applies. Use the given probability of success p to find the indicated probability.

Find P(4) when p=0.70.

P(4)=

(Round to five decimal places asneeded.)