Question: 3 2 - 3 4 . ) A concrcte strength of 4 0 0 0 psi is specified. Determine the reaquired average compressive strangth for:

32-34.) A concrcte strength of 4000 psi is specified. Determine the reaquired average compressive strangth for:
A new plant where standard deviation is uknown
A plant where s=200 psi for 17 test results
34> A plant with an extensive history of producing conerete with 5=520 psi
3 2 - 3 4 . ) A concrcte strength of 4 0 0 0 psi

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