In late may, 2016, lake mead, which supply water for 25 million people in nevada, arizona, and california, sank to its lowest level of 1,072 since the reservoir was filled in the 1930s. however, in 1983 it was at full capacity at 1225 ft above sea level. note: in 2019, lake mead is currently 40% of its full capacity. determine the rate of change in this situation.

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables