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Homework Help: Binomial Distribution

  1. Nov 7, 2012 #1
    1. The problem statement, all variables and given/known data

    Hello, I am trying to calculate the following:

    15!/(1!)(14!) x (0.80)^14 x (0.2)^1

    I understand the problem as I have already put the numbers together. My trouble is actually using the calculator to find the answer. When I try to find 15! = 1.307674368^12

    I am confused about this.

    The answer for the problem should be 0.132.
  2. jcsd
  3. Nov 7, 2012 #2


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    Using the calculator that way might go wrong if the numbers get too big for the calculator to maintain 100% accuracy. There really is no need to calculate 15!. There's an easy simplification available.
  4. Nov 7, 2012 #3
    But there's answer available for the problem. My answer at first was 0.00132.

    But it should be 0.132
    Last edited: Nov 7, 2012
  5. Nov 7, 2012 #4


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    Without your calculator, on a sheet of paper write down ##\frac{15!}{14!}## writing out the factorials. It simplifies.
  6. Nov 7, 2012 #5
    THANKS!! Now, I got the right answer!
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