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Hello! Can someone show me how to do this, my prof. didn't go over it in...

Hello! Can someone show me how to do this, my prof. didn't go over it in class and I can't find videos on it

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If 4 titrations were run which resulted in the following data sets, calculate the precision of the titrations.   

a.) DATA : 48.62%, 48.43%, 49.08%, 48.78%
b.) DATA : 7.68%, 7.84%, 6.94%, 7.29%

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