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ACI 214 Summary of 1188255 [ 4000 psi] <br /> ACI 214 SUMMARY <br /> Statistical Strength Summary <br /> Average strength based on 44 tests 4490 psi <br /> Overall Standard Deviation 479 psi <br /> Control is Very Good <br /> Overall coefficient of variation : 10.67 % <br /> Overall within-test coefficient of variation . 2.00 % <br /> Control is Excellent <br /> Chance of strength falling below 4000 psi 15.2 % <br /> Chance of strength falling below 3500 psi 1.9 % <br /> Chance of "Average of 3" below 4000 psi 3.7 % <br /> ACI 214 Minimum Recommended Strength • 4642 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 />