Question: How do I manually calculate the standard deviation with this formula, when my mean is 0.54%, my variance is 0.24% and number of periods is

How do I manually calculate the standard deviation with this formula, when my mean is 0.54%, my variance is 0.24% and number of periods is 11.

How do I manually calculate the standard deviation with this formula, when

I know the answer is 4.93% from excel, but can't work out how to put it into this formula..

SD(rt)=Var(rt)rt=n1rt

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