One-hour carbon monoxide concentrations in air samples from a large city have an
Chapter 4, Problem 4.94(choose chapter or problem)
One-hour carbon monoxide concentrations in air samples from a large city have an approximately exponential distribution with mean 3.6 ppm (parts per million). a Find the probability that the carbon monoxide concentration exceeds 9 ppm during a randomly selected one-hour period. b A traffic-control strategy reduced the mean to 2.5 ppm. Now find the probability that the concentration exceeds 9 ppm.
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