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Suppose the concentration of welding fumes, X, is approximately bell-shaped with a mean of / = 52 ppm and standard deviation o = 7 ppm.

Suppose the concentration of welding fumes, X, is approximately bell-shaped with a mean of / = 52 ppm and standard deviation o = 7 ppm. Determine the z-score for a concentraion of 45 ppm. Round to 2 decimal places. Number Estimate what percentage of time the concentration would be less than 45 ppm. Round to the nearest whole percentage. 15 9% 97 7% 2.3% 84 1% Formula sheet (calculator is below) Ex x - Ex X - Efx Z( w-x) N Ew E ( x -7 )

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