Results 1 to 4 of 4

Math Help - [SOLVED] coin tosses

  1. #1
    Newbie
    Joined
    Oct 2008
    Posts
    13

    [SOLVED] coin tosses

    question:

    We toss a coin 5 times in a row. Find the probability that the number of tales is at least 1.

    I believe the answer is 4/5 can someone confirm or deny this please.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,614
    Thanks
    1581
    Awards
    1
    Quote Originally Posted by graffitihead View Post
    We toss a coin 5 times in a row. Find the probability that the number of tales is at least 1.
    I believe the answer is 4/5 can someone confirm or deny this please.
    Well it is actually \frac{6}{32}. Can you see why?

    There are 2^5=32 possible outcomes here. Why?
    So where does the 6 come from?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Oct 2008
    Posts
    13
    I understand the 32 but it seems like it would be 5 choose 1 over 32 or 5/32.

    would you explain the 6 please.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,614
    Thanks
    1581
    Awards
    1
    Quote Originally Posted by graffitihead View Post
    I understand the 32 but it seems like it would be 5 choose 1 over 32 or 5/32. would you explain the 6 please.
    Sorry, I misread your question. I read it as "at most one”.
    So the answer to at one is \frac{31}{32}.
    The only case we cannot allow is HHHHH.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Three tosses of a fair coin
    Posted in the Statistics Forum
    Replies: 1
    Last Post: August 31st 2011, 05:22 PM
  2. Sequence of coin tosses.
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: June 26th 2011, 10:53 AM
  3. theoretical probability of coin tosses
    Posted in the Advanced Statistics Forum
    Replies: 8
    Last Post: May 3rd 2011, 07:38 PM
  4. In 200 tosses of a coin,
    Posted in the Statistics Forum
    Replies: 10
    Last Post: January 1st 2010, 03:43 AM
  5. Probability - coin tosses
    Posted in the Advanced Statistics Forum
    Replies: 5
    Last Post: April 30th 2008, 01:26 PM

Search Tags


/mathhelpforum @mathhelpforum