Results 1 to 2 of 2

Math Help - probability distribution ...

  1. #1
    Member
    Joined
    Jul 2006
    Posts
    95

    probability distribution ...

    Hello,
    I face some problem in this question plz try to solve that.
    Thanks .

    Question:
    Suppose is a random variable best described by a probability distribution given as:f(x)1/25 , 20 less than equal x less than equal 45.

    Find the Expected value of X.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by m777 View Post
    Hello,
    I face some problem in this question plz try to solve that.
    Thanks .

    Question:
    Suppose is a random variable best described by a probability distribution given as:f(x)1/25 , 20 less than equal x less than equal 45.

    Find the Expected value of X.
    Please try to type the question more carefully.

    I will answer this question:

    "Suppose X is a random variable best described by a probability distribution given as:

    f(x) = 1/25 , 20 <= x <= 45.
    f(x) = 0 otherwise"

    Then X has a uniform distribution on [20, 45], or X \sim U(20, 45). Now we
    can calculate the mean as:

    <br />
\bar{x} = \int_{20}^{45} x f(x) dx <br />

    or we can use the fact that we know that the mean is the midpoint of the
    interval or: 32.5

    RonL
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: February 18th 2010, 01:54 AM
  2. probability distribution
    Posted in the Statistics Forum
    Replies: 4
    Last Post: September 17th 2009, 03:50 PM
  3. probability distribution
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 11th 2008, 02:47 AM
  4. Probability Distribution?
    Posted in the Statistics Forum
    Replies: 1
    Last Post: June 25th 2008, 07:42 PM
  5. Probability distribution
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 26th 2007, 04:16 AM

Search Tags


/mathhelpforum @mathhelpforum