Results 1 to 4 of 4

Math Help - probability

  1. #1
    Newbie
    Joined
    Dec 2008
    Posts
    12

    probability

    the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by Zandra View Post
    the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass.
    Do you mean that the average number of students who pass a test is 70% ? If so, then:

    Let X be the random variable number of students who pass.

    X ~ Binomial(n = 8, p = 0.7)

    Calculate \Pr(X \geq 5).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Sep 2008
    From
    West Malaysia
    Posts
    1,261
    Quote Originally Posted by Zandra View Post
    the average pass % in a test is 70. find out the probability tht out of a group of 8 students atleast 5 pass.

    Try Binomial distribution
    X-B(8 , 7/10)
    Let x be the random variable of students passing the test .

    P(X\geq5)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Dec 2008
    Posts
    12
    thankyou
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 10
    Last Post: January 21st 2011, 11:47 AM
  2. Replies: 3
    Last Post: May 29th 2010, 07:29 AM
  3. fundamental in probability & convergence with probability 1
    Posted in the Advanced Statistics Forum
    Replies: 3
    Last Post: February 23rd 2010, 09:58 AM
  4. Replies: 1
    Last Post: February 18th 2010, 01:54 AM
  5. Replies: 3
    Last Post: December 15th 2009, 06:30 AM

Search Tags


/mathhelpforum @mathhelpforum