Math CentralQuandaries & Queries


Question from Timothy:

Liza knows that in the long term, she has a 65% chance of making a sale when calling on customers. One morning, he makes Six calls.
a. What is her probability of making three calls?
b. What is her probability of making sales fewer than three?

Hi Timothy,

I think part a. should read

a. What is her probability of making three sales?

I think also that you are to assume that the probability of making a sale on a call is independent of whether you made sales on the previous calls. In this case you are using the Binomial Distribution and I suggest you look at my response to Venni's previous question.

Using the notation in this response, for part a. $n = 6, r = 3, \mbox{ and } p = 0.65.$


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