Concrete formulated for use in commercial structures is designed to withstand pressures of 4000 pounds per square inch. The data set below represents the strength of 20 randomly selected samples of concrete. Click on the Data button shown below to display the data and enter to your calculator. Then compute the mean and standard deviation. Data Strength 4385 3935 4480 4009 4276 4046 3905 4030 4458 3971 4303 4025 4253 4058 4269 4047 4238 4425 3997 4282

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