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Step 7 Under a normal distribution, the mean is EX), and the standard deviation og is calculated using the formula below. When the compressive

Step 7 Under a normal distribution, the mean is EX), and the standard deviation og is calculated using the formula below. When the compressive strength for specimens of the mixture has a mean a 1,450, then E(X)- decimal places. 70 x Use the given values -20 and n-14 to calculate og rounding the result to three

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