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ACI 214 Summary of 1188290 [ 3000 psi] <br /> ACI 214 SUMMARY <br /> Statistical Strength Summary <br /> Average strength based on 20 tests • 3660 psi <br /> Overall Standard Deviation • 824 psi <br /> Control is Poor <br /> Overall coefficient of variation . 22.53 % <br /> Overall within-test coefficient of variation : 2.15 % <br /> Control is Excellent <br /> Chance of strength falling below 3000 psi • 20.9 % <br /> Chance of strength falling below 2500 psi 7.9 % <br /> Chance of "Average of 3" below 3000 psi • 8.2 % <br /> ACI 214 Minimum Recommended Strength 4575 psi <br /> Standard deviation adjusted for 20 tests . 890 psi <br /> Chance of strength less than specified - 500 <= 1 in 100 <br /> Chance of "Average of 3" less than specified <= 1 in 100 <br />