Results 1 to 6 of 6

Math Help - Binomial distribution.

  1. #1
    Newbie
    Joined
    Apr 2011
    Posts
    7

    Binomial distribution.

    Hey Guys, I need some more help here.

    Im not sure how to solve this question:

    It is known in the ice cream industry that 38% of people have chocolate as their favorite flavor ice cream.

    Let X be the number of people in a sample of 10 who say chocolate is their favourite ice-cream flavor.

    Calculate: P(X < 3)


    Thanks.
    Last edited by mr fantastic; April 15th 2011 at 11:14 PM. Reason: Re-titled.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    May 2010
    Posts
    1,027
    Thanks
    28
    P(X<3) = P(X=0) + P(X=1)+ P(X=2)

    You should have been taught a method for finding the probabilities on the right hand side before being set the question. (binomial distribution, maybe?)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2011
    Posts
    7
    no I wasn't given any method on how to solve this question, this is exactly the question given to me, so I myself am confused. Pls continue to guide me through this question.

    Thanks alot
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,383
    Thanks
    1474
    Awards
    1
    Quote Originally Posted by axz92 View Post
    It is known in the ice cream industry that 38% of people have chocolate as their favorite flavor ice cream. Let X be the number of people in a sample of 10 who say chocolate is their favorite ice-cream flavor. Calculate: P(X < 3)
    This is simple binominal probability. We assume independence, the number of trials is N=10, the probability of success is p=0.38.
    P(X=k)= Combin(N,k)p^k(1-p)^{N-k}, k=0,1,2. Add those up.

    Note that the LaTeX compiler is down.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Apr 2011
    Posts
    7
    How did u get the value 0,1,2 for the variable K?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by axz92 View Post
    How did u get the value 0,1,2 for the variable K?
    *Ahem* ....
    Quote Originally Posted by axz92 View Post
    Hey Guys, I need some more help here.

    [snip]

    Calculate: P(X < 3)
    Re:
    Quote Originally Posted by axz92 View Post
    no I wasn't given any method on how to solve this question, this is exactly the question given to me, so I myself am confused. Pls continue to guide me through this question.

    Thanks alot
    Then why would you be set this question to do?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: March 21st 2010, 05:25 PM
  2. Replies: 1
    Last Post: November 12th 2009, 12:38 AM
  3. Replies: 1
    Last Post: March 11th 2009, 11:09 PM
  4. Cumulative distribution function of binomial distribution
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: October 31st 2008, 03:34 PM
  5. Binomial distribution help!
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: July 17th 2008, 08:18 PM

Search Tags


/mathhelpforum @mathhelpforum