Results 1 to 4 of 4

Math Help - advanced stats

  1. #1
    Newbie
    Joined
    Mar 2013
    From
    Texas
    Posts
    3

    advanced stats

    i need help with a couple of questions:

    Suppose the generator is asked to produce 10,000 numbers between 20 and 25. Find the expected value and the standard deviation of this data?


    Brand A sells for $12, B for $25, C$40. Of the USBs sold: 65% from Brand A, 25% from B and 10% from C. The profit for the company is 40% of the retail value, so y=4x for the rv for the profit. Find the expected value and the variance for the profit.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,619
    Thanks
    592

    Re: advanced stats

    Hey lrocha91.

    The first thing you need to do is assign a distribution to the numbers and since they are "generated" I'm assuming a uniform distribution: is this correct?

    Hint: Can you calculate the expectation and sample variance of the data?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Mar 2013
    From
    Texas
    Posts
    3

    Re: advanced stats

    i'm assuming you can. but i have no clue how to approach and continue these questions. i've just gone in circles.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,619
    Thanks
    592

    Re: advanced stats

    What is the expectation of a uniform distribution U(20,25)?

    Hint: The PDF function is f(x) = 1/5 and the expectation is E[X] = Integral (20 to 25) x*(1/5)dx.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Going from basics to advanced?
    Posted in the Algebra Forum
    Replies: 7
    Last Post: January 28th 2011, 04:12 AM
  2. Advanced Stats
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: August 15th 2009, 02:48 PM
  3. Help with Matlab - advanced stats
    Posted in the Math Software Forum
    Replies: 2
    Last Post: January 29th 2009, 10:00 AM
  4. Advanced Probability Help!!!
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: April 16th 2008, 04:21 PM
  5. advanced function
    Posted in the Calculus Forum
    Replies: 1
    Last Post: August 9th 2007, 01:56 PM

Search Tags


/mathhelpforum @mathhelpforum