According to the paper Commuters Exposure to Particulate Matter and
According to the paper “Commuters’ Exposure to Particulate Matter and Carbon Monoxide in Hanoi, Vietnam” (Transportation Research [2008]: 206–211), the carbon monoxide exposure of someone riding a motorbike for = km on a highway in Hanoi is approximately normally distributed with a mean of 18.6 ppm. Suppose that the standard deviation of carbon monoxide exposure is 5.7 ppm. Approximately what proportion of those who ride a motorbike for = km on a Hanoi highway will experience a carbon monoxide exposure of more than 20 ppm? More than 25 ppm?
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