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Mathematics, 22.06.2019 12:20 902coo

Assume that trees are subjected to different levels of carbon dioxide atmosphere with 4% of the trees in a minimal growth condition at 370 parts per million (ppm), 11% at 440 ppm (slow growth), 46% at 550 ppm (moderate growth), and 39% at 670 ppm (rapid growth). what is the mean and standard deviation of the carbon dioxide atmosphere (in ppm) for these trees?

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