The lengths of trout in a lake are normally distributed with a mean of 30 inches and a standard deviation of 4.5 inches.

enter the z-score of a trout with a length of 28.2 inches.

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

Will give a: 122 b: 90 c: 48 d: 180

Select the correct answer and solve for y