Find out the indicated probabilities using geometric distribution or Poisson distribution. The determine if the events are unusual. If convenient employ a Poisson probability table or technology to the probabilities. Suppose the probabilty that you will make a sale on any given phone call 0.14. Find out the probability that you (A) make your first sale on the fifth call, (b) make your sale on the first, second or third call, or (c) don't make a sale on the first three calls.
(a) P(make your first sale on the fifth call)
(b) P(make your sale on the first, second or third call)
(c) P(do not make a sale on the first three calls)