The relative standard deviation (RSD) of this method is less than 5 % and this method has been used to determine trace amounts of n...

该方法用于聚氨酯中微量游离异氰酸酯基的测定，相对标准偏差小于5%，具有简便、快速、准确、可靠的特点。

youdao

So, the optimal thing to do if you live in a world like this n is to get n as large possible and you can reduce the standard deviation of the portfolio very much and there's no cost in terms of expected return.

如果现实中也这样简单的话,那么你就尽量增大,这样就能让投资组合的标准差,就会大大降低,从预期收益率的角度来看,这样做的成本是零。

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