Question: The compressive strength required for a concrete batch to be used for constructing a footing is 4 4 0 psi. What target strength should be

The compressive strength required for a concrete batch to be used for constructing a footing is 440 psi. What target strength should be used for the mix design of the concrete? No previous data for the standard deviation is available.
Answer:
The compressive strength required for a concrete

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