I need help proving that the following (double) integral is positive:(adsbygoogle = window.adsbygoogle || []).push({});

int(limits from -infinity to +infinity) f(b) int(limits from b to +infinity) [e^{-(x-mean)/(2 *variance)}]/sq root(2 *pi *variance) dx db

thanks

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# Need to prove that the following integral is positive

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