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Math Help - Stats Problem....

  1. #1
    spn
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    Stats Problem....

    I have exams comming up, so practice exam is what i am doing.. however they dont give solutions which is a pain.. anyone care to solve this question because i get stuck.. umm at the start?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by spn View Post
    I have exams comming up, so practice exam is what i am doing.. however they dont give solutions which is a pain.. anyone care to solve this question because i get stuck.. umm at the start?
    The random variable X has density:

    <br />
f_X(x) = \left\{ \begin{array}{cc}<br /> <br />
x^2, & \mbox{ for } 0 < x < k \\<br />
0, & \mbox{ for } x<0,\mbox{ or } x>k <br /> <br />
\end{array}\right.<br />

    1. Find the constant k.

    To be a density we need \int_0^k x^2 dx = 1, so find the k
    which dose this.
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  3. #3
    spn
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    cheers ... any ideas how to do the rest? stats is not my fortre, i prefer real algebra that dont require guess work H
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