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Need help with probability questions

  1. Sep 29, 2013 #1
    1. The problem statement, all variables and given/known data

    Q: Approximately 16% of the calls to an airline reservation phone line result in a reservation being made.

    a. Suppose that an operator handles 15 calls. What is the probability that none of the 15 calls result in a reservation? (Give the answer to 3 decimals places.)

    I have tried

    1-.16=.84 (incorrcect)

    I thought maybe it was not probable for an answer of 0 (incorrect)

    I also at one point ended up with the answer 0.011 but cannot remember how I got that answer



    b.What is the probability that at least one call results in a reservation being made? (Give the answer to 3 decimals places.)


    I would think you would divide 1 by 15. Probable opportunities divided by actual opportunities. But, I am sure I am supposed to use the 16% in this equation somewhere....very stuck.

    2. Relevant equations

    I am new to this and this is my first math class in 25 years so I am not sure what to put here.


    3. The attempt at a solution

    for part a:
    I have tried

    1-.16=.84 (incorrcect)

    I thought maybe it was not probable for an answer of 0 (incorrect)

    I also at one point ended up with the answer 0.011 but cannot remember how I got that answer

    for part b

    I would think you would divide 1 by 15. Probable opportunities divided by actual opportunities. But, I am sure I am supposed to use the 16% in this equation somewhere....very stuck.
     
  2. jcsd
  3. Sep 30, 2013 #2

    UltrafastPED

    User Avatar
    Science Advisor
    Gold Member

    The calls are independent of each other, so each call has p=0.16 for creating a reservation.

    Now you queue up the calls ...

    A similar, perhaps easier to grasp, problem is the following:
    1. each coin flip is p=0.50 heads
    2. You flip the coin 15 times
    3. What is the probability that none of the coin flips is heads?
     
  4. Sep 30, 2013 #3
    Did you manage to follow what was going on in class? Do have some notes or a handout from the class? Or a set book?

    OK, I'll help you through this just this once :smile:

    What percentage of the time does the first call not result in a reservation?
     
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