A group of adults (x) and kids (y) go to the theater.
There are two fewer adults
than kids, Adult tickets
cost $6 each and kid
tickets cost $2.50 each,
The total cost for the group
was $39.00 How many
kids and adults were
there?

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