The target mean strength f cm for concrete mix design obtained

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The target mean strength f cm for concrete mix design obtained from the characteristic strength f_ck and standard deviation σ, defined in IS: 456-2000, is

1. f_ck + 1.35 σ
2. f_ck + 1.45 σ
3. f_ck + 1.55 σ
4. f_ck + 1.65 σ

Correct Option: D

f_ck + 1.65 σ