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#1 2006-11-15 02:24:52

morik
Member
Registered: 2005-11-23
Posts: 16

2 Tricky Probability Questions

A salesman works for 236 days of the year and makes 8 calls each working day.
Moreover on average he has a 20 percent chance of making a sale on each call.

1. What is the probability that he makes no sales at all on a given day?

2. On about how many days will he make no sales at all?

Help would be brilliant! I don't know where to even start on this problem.

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#2 2006-11-15 02:33:14

Toast
Real Member
Registered: 2006-10-08
Posts: 1,321

Re: 2 Tricky Probability Questions

1. He has a 0.8 chance to not make a sale, and since he makes 8 calls each day, the chance is 0.8^8.

2. This is the answer to 1. multiplied by 236.

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