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    powerpuff_gal's Avatar
    powerpuff_gal Posts: 11, Reputation: 1
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    #1

    Dec 11, 2010, 08:32 AM
    cumulative distribution function
    The length of time required by students to completea 1 hour exam is a random variable with a density function given by

    f(y)={cy^2+y, 0<y<1
    {0 , elsewhere

    a)find the value of c.
    b)find the cumulative distribution F(y)
    c)use F(y)in (b)to find F(-1),F(0),and F(1).
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Dec 11, 2010, 09:16 AM
    Quote Originally Posted by powerpuff_gal View Post
    The length of time required by

    students to completea 1 hour exam is a random variable with a density

    function given by


    a)find the value of c.
    Set up the integral:



    Integrate the definite integral, set your result equal to 1 and solve for c.

    The total probability is equal to 1, so that is why we set the result equal to 1. Use this to answer the other parts of the problem.
    powerpuff_gal's Avatar
    powerpuff_gal Posts: 11, Reputation: 1
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    #3

    Dec 12, 2010, 07:07 AM
    Comment on galactus's post
    My answer of c is 3/2,but actually how to going to solve the question (b) and (c)><i really depressed of it,can u show me the solution of this 2 question?thanks a lot about it!!
    powerpuff_gal's Avatar
    powerpuff_gal Posts: 11, Reputation: 1
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    #4

    Dec 18, 2010, 01:43 AM
    Anyone can help me solve the question b and c?? plssssssss!I really need the help
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