If the characterisitcstrength of concrete fck is definedas the strength below which notmore than 50% of the test resultsare expected to fall theexpression for fck in terms ofmean strength fm and standarddeviation S would be

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If the characterisitcstrength of concrete fck is definedas the strength below which notmore than 50% of the test resultsare expected to fall theexpression for fck in terms ofmean strength fm and standarddeviation S would be