Results 1 to 5 of 5

Math Help - [SOLVED] Bernoulli Trials

  1. #1
    Newbie
    Joined
    Nov 2008
    Posts
    16

    [SOLVED] Bernoulli Trials

    There are 2 questions:

    A basketball player makes free throws with a 0.55 probability. What is the probability that the player will make at least 5 of the next 6 free throws?

    The answer I got for this was 0.1359 if you round via 4 decimals. But checker says this is wrong. I've double checked my work and I don't think it's wrong.

    The other question was:

    An unfair coin with 0.62 probability of tails is flipped 4 times. What is the probability of obtaining exactly 3 heads?

    The answer I got for this was 0.3623 if you round via 4 decimals. Again the same problem with it.

    Is this correct or did I just get the wrong answer entirely?


    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    P(x=5)+p(x=6)

    where you have a binomial rv with n=6 and p=.55

    show me your work and I'll examine it.


    (2) is 4 (.62)^3(.38) which is approximately .36225856
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Nov 2008
    Posts
    16
    This is the first one:



    If you got that for number 2, then that means that my answer of .3623 is SUPPOSED to be correct.

    The proff told us to round to 4 decimals.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,763
    Thanks
    5
    YOU found P(X=5) NOT at least 5 of the next 6
    Last edited by matheagle; October 22nd 2009 at 11:35 PM.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Nov 2008
    Posts
    16
    AHA I think I got what you meant there. I'll do some quick reworking.

    .163571 for the basketball problem.

    Ok, so now that I have that out of the way....is the 2nd answer correct?

    edit: I was going to hit the thanks button ;p you didn't have to hint!

    And I figured out what was wrong with the 2nd answer....we're both wrong cause we didn't have the correct probability!
    Last edited by Sakurazaki; October 22nd 2009 at 07:28 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Bernoulli trials
    Posted in the Advanced Statistics Forum
    Replies: 6
    Last Post: December 15th 2010, 06:57 AM
  2. Help w/ Bernoulli Trials
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: October 10th 2010, 04:52 PM
  3. Bernoulli Trials
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: December 9th 2009, 07:43 PM
  4. Bernoulli Trials
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 29th 2009, 07:41 PM
  5. Bernoulli trials
    Posted in the Statistics Forum
    Replies: 0
    Last Post: October 28th 2009, 05:52 PM

Search Tags


/mathhelpforum @mathhelpforum