Finding value of z-score.

How do I find the corresponding value to a certain z-score? Besides using the table of value.

I was assuming that if $\displaystyle z>0$ then I need to compute:
$\displaystyle \frac{1}{ \sqrt{\pi} } \int_0^z e^{-x^2} dx$
But that does not work when I numerically integrate that.

Quote:

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Originally Posted by ThePerfectHacker

How do I find the corresponding value to a certain z-score? Besides using the table of value.

I was assuming that if $\displaystyle z>0$ then I need to compute:
$\displaystyle \frac{1}{ \sqrt{\pi} } \int_0^z e^{-x^2} dx$
But that does not work when I numerically integrate that.

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$\displaystyle \frac{1}{ \sqrt{2 \pi} } \int_0^z e^{-x^2/2} dx$

RonL