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Math Help - standard normal distribution

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    standard normal distribution

    The lower and upper deciles of any distribution are the points that mark off the lowest 10% and the highest 10%. What are the lower and upper deciles of the standard normal distribution?
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    Quote Originally Posted by DINOCALC09 View Post
    The lower and upper deciles of any distribution are the points that mark off the lowest 10% and the highest 10%. What are the lower and upper deciles of the standard normal distribution?
    Use your tables in an inverse way to find:

    1. The value of a such that Pr(Z < a) = 0.1.

    2. The value of b such that Pr(Z > b) = 0.1 <=> 1 - Pr(Z < b) = 0.1 <=> Pr(Z < b) = 0.9.

    By symmetry you should realise that in fact a = -b.
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