Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Probability question on bank customers

  1. Jun 8, 2008 #1
    The probability of a customer arriving in a bank per minute is 0.9. How many customers will arrive in 10 minutes?

  2. jcsd
  3. Jun 8, 2008 #2


    User Avatar

    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?
  4. Jun 8, 2008 #3
    I have absolutely no idea
  5. Jun 8, 2008 #4
    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.
  6. Jun 8, 2008 #5
    Correct. On average...
  7. Jun 8, 2008 #6
  8. Jun 9, 2008 #7
    Think about what a probability is. Then think about how the probability of 0.9 was determined. At that point the answer is obvious.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook