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Suppose the concentraion of welding fumes, X, is approximately bell-shaped with a mean of / - 59 and standard deviation o = 6. Estimate what

Suppose the concentraion of welding fumes, X, is approximately bell-shaped with a mean of / - 59 and standard deviation o = 6. Estimate what percentage of time the concentration would be between 47 and 59. Round to the nearest whole percentage. Number %

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