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: Finding a Minumum N from Binomial Distribution

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

    From the text: Use Hershey's Kisses to estimate the probability that when dropped, they land with the flat part lying on the floor. How many trials are necessary to get a result that appears to be reasonably accurate when rounded to the first decimal place?

    2. Relevant equations

    3. The attempt at a solution

    Well assuming that I already obtained some ration through a numerous amount of trials ( by the Law of Large Numbers), how would I use that value to obtain a minimum N amount of trails necessary to get a reasonably accurate result?

    I know that the Binomial Probability Formula is:

    P(x) = [itex]\frac{n!}{(n-x)!x!}[/itex] [itex]\bullet[/itex] px [itex]\bullet[/itex] qn-x

    How would one isolate n in that formula though? Or should I approach this a different way?
  2. jcsd
  3. May 2, 2012 #2


    User Avatar
    Science Advisor

    The wording of this problem implies that they expect you to actually do this experiment, using Hershey Kisses, then use the data from your experiment.
  4. May 2, 2012 #3

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    You will also need to decide what is meant by "appears to be" and "reasonably accurate". (These would be issues on which people can honestly disagree!)

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook