If the characteristic strength of concrete fck is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for fck in terms of mean strength fm and standard deviation ¯¯¯σ would be

If the characteristic strength of concrete fck is defined as the stren

1.	If the characteristic strength of concrete fck is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for fck in terms of mean strength fm and standard deviation ¯¯¯σ would be
Answer» If the characteristic strength of concrete $f_{c k}$ is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for $f_{c k}$ in terms of mean strength $f_{m}$ and standard deviation $¯ ¯ ¯ σ$ would be

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If the characteristic strength of concrete fck is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for fck in terms of mean strength fm and standard deviation ¯¯¯σ would be

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