How to use this in QlikView: Pr(mu-sigma<=x<=mu+sigma)?

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Hi all,

$\begin{align}
 \Pr(\mu-\;\,\sigma \le x \le \mu+\;\,\sigma) &\approx 0.6827 \\
 \Pr(\mu-2\sigma \le x \le \mu+2\sigma) &\approx 0.9545 \\
 \Pr(\mu-3\sigma \le x \le \mu+3\sigma) &\approx 0.9973
\end{align}
$

Can anyone tell me how to calculate this expressions?

Regards

Sagar Gupta

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