Solve

10. 11. a) b) c) d) oD) g) h) j) Alex sells \"Exciting World of Statistics\" videos over the phone to earn some extra cash during the economic crisis. Only 10% of all calls result in a sale. Assume that the outcome of each call is independent of the others. What is the probability that Alex makes his first sale on the fifth call? What is the probability that Alex makes his first sale on an odd-numbered call? What is the probability that it takes Alex at least 10 calls to make his first sale? What is the probability that it takes Alex at most 6 calls to make his first sale? What is the probability that Alex makes his second sale on the ninth call? What is the probability that Alex makes his second sale on an odd-numbered call? Hint: Consider [Answer] 0.9%x[ Answer]. On one side, you will have 0.19 x [ Answer |. On the other side, you will have a geometric series. What is the probability that Alex makes his third sale on the 13 th call? If Alex makes 15 calls, what is the probability that he makes exactly 3 sales? If Alex makes 15 calls, what is the probability that he makes at least 2 sales? If Alex makes 15 calls, what is the probability that he makes at most 2 sales