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i am not able to understand target mean strength of concrete..what is it*

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i am not able to understand target mean strength of concrete..what is it*
in Concrete Technology by  

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I think we perform an experiment on some specimens of 50cm^2 and we plot the normal distribution curves against no of specimens and compressive strength there we got the target mean strength.
                           Target mean strenght(fm)=Characteristic cube strength(fck)+1.65*sigma(standard deviation)
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