1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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