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Let the characteristic strength be defined as that value, below which not more than $50 \%$ of the results are expected to fall. Assuming a standard deviation of $4$ MPa, the target mean strength (in MPa) to be considered in the mix design of a $M25$ concrete would be

  1. $18.42$
  2. $21.00$
  3. $25.00$
  4. $31.58$
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