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Math Help - standard distribution. Help!

  1. #1
    Newbie Almondzqueen's Avatar
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    standard distribution. Help!

    The weights of certain hardcover books on a small shelf are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.

    So my answer looks like this:
    z= x-u/σ
    1.645 = x -9.75 -.08
    1.645*.08 + 9.75 = 9.8816

    Is this the answer? I have this class online and its hard to reach the teacher sometimes. I have a feeling this problem is incomplete. Can anyone enlighten me?
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  2. #2
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    Quote Originally Posted by Almondzqueen View Post
    The weights of certain hardcover books on a small shelf are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.

    So my answer looks like this:
    z= x-u/σ
    1.645 = x -9.75 -.08
    1.645*.08 + 9.75 = 9.8816

    Is this the answer? I have this class online and its hard to reach the teacher sometimes. I have a feeling this problem is incomplete. Can anyone enlighten me?
    You've found the weight that seperates the top 5%. Now you have to find the weight that seperates the bottom 5%.
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