105. Carbon Dioxide Concentration. The Carbon Dioxide Information Analysis Center (cdiac.ornl.gov/pns/current_ghg.html) reported in 2014 that the mean concentration of the greenhouse gas carbon dioxide is 397 parts per million (ppm). Suppose the population is normally distributed, assume that the standard deviation is 25 ppm, and suppose we take atmospheric samples from 25 cities.
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(a) 0.9544 (b) 397 ppm; in a normal distribution the median equals the mean. (c) 384.12 ppm and 409.88 ppm