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Mathematics, 16.10.2019 00:00 jaylene33002
High-strength concrete is supposed to have a compressive strength greater than 6,000 pounds per square inch (psi). a certain type of concrete has a mean compressive strength of 7,000 psi, but due to variability in the mixing process it has a standard deviation of 420 psi, assuming a normal distribution.
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High-strength concrete is supposed to have a compressive strength greater than 6,000 pounds per squa...
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