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Math Help - Mini Prob. question #2

  1. #1
    Junior Member
    Joined
    Sep 2008
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    25

    Mini Prob. question #2

    Determine the z score given the mean of 172, standard deviation of 8 and x - value or 192

    Z score = {x} - {\mu}    / {\sigma}

    So it goes like this...

    Z = 192-172/8
    Z = 2.5

    Now i look back in the book and find the z score on the table.

    i get a value of 0.9938...
    what am i doing wrong?
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  2. #2
    Member
    Joined
    May 2006
    Posts
    244
    Quote Originally Posted by Faisal2007 View Post
    Determine the z score given the mean of 172, standard deviation of 8 and x - value or 192

    Z score = {x} - {\mu} / {\sigma}

    So it goes like this...

    Z = 192-172/8
    Z = 2.5

    Now i look back in the book and find the z score on the table.

    i get a value of 0.9938...
    what am i doing wrong?
    The question only asks for the z-score not the p-value corresponding to it. Your work looks OK, except you should use brackets to write:

    z=(192-172)/8

    or in LaTeX:

    [tex]z=(192-172)/8=\frac{192-172}{8}[/tex]

    z=(192-172)/8=\frac{192-172}{8}

    .
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