In Zachs class 3/5 of the 25 students are boys. How many boys are in Zachs class?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Opposite angles in a parrellelogram are

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