Question: A structural engineer specifies a concrete strength of 4 8 0 0 . The concrete plant has a long history of production and testing. The

A structural engineer specifies a concrete strength of 4800. The concrete plant has a long history of production and testing. The historical data (>30 samples) indicate a standard deviation of 650 psi. What is strength that should be used for mix design considering 90% reliability? (psi)
Group of answer choices
4800
5815
6102
5671

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