*I have already posted this in another forum, but re-read the rules regarding homework questions.. Mods, I hope this is ok*(adsbygoogle = window.adsbygoogle || []).push({});

Hey guys, I've got this question from my Statistics Homework and wondered if someone could point me to a web site or supply some advice as to how to begin to solve the problem.

Bags of sweets are packed by a machine such that the masses (X) have a normal distribution with mean 250g and standard deviation 10g.

A bag is judged to be underweight and rejected if X<225g.

A bag is judged to be overweight and rejected if X>270g

What percentage of bags are rejected?

I've tried a few combinations, but without a formula I don't think I'm making any sense. Can an altered version of the formula for Standard Deviation be used?

Any help always appreciated : )

Matt

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# Homework Help: A form of standard deviation?

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