Question: The specified concrete strength f c ' for a construction project is 4 5 0 0 psi. The required average strength f c r '

The specified concrete strength fc' for a construction project is 4500 psi. The required average strength fcr' is estimated as 5500 psi based on 20 test results for similar projects. Determine the sample standard deviation s of the 20 test results.
The specified concrete strength f c ' for a

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