A farm has chickens and cows. All the cows have `4` legs and all the chickens have `2` legs. All together, there are `82` cow and chicken legs on the farm. Complete the table to show some possible combinations of chickens and cows to get `82` total legs.

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