1. Jun 8, 2008 #1

   aaa59

   

   The probability of a customer arriving in a bank per minute is 0.9. How many customers will arrive in 10 minutes?
   
   Thanks
   Ashish

    

   aaa59, Jun 8, 2008
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3. Jun 8, 2008 #2

   berkeman

   

   Staff: Mentor

   What are your thoughts on how to approach this question? Does the probability of a customer arriving in the first minute affect the probability of a customer arriving in the second minute? What is this property called, and how does it help guide you to the answer here?

    

   berkeman, Jun 8, 2008
4. Jun 8, 2008 #3

   aaa59

   

   I have absolutely no idea

    

   aaa59, Jun 8, 2008
5. Jun 8, 2008 #4

   aaa59

   

   I would say that in 1 minute there is a 90% chance that a customer may arrive, so in 10 minutes the number of customers I would expect is 9.

    

   aaa59, Jun 8, 2008
6. Jun 8, 2008 #5

   montoyas7940

   

   Correct. On average...

    

   montoyas7940, Jun 8, 2008
7. Jun 8, 2008 #6

   aaa59

   

   thanks

    

   aaa59, Jun 8, 2008
8. Jun 9, 2008 #7

   Dylanette

   

   Think about what a probability is. Then think about how the probability of 0.9 was determined. At that point the answer is obvious.

    

   Dylanette, Jun 9, 2008

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