For males in a certain town, the systolic blood pressure is normally distributed with a mean of 125 and a standard deviation of 8. Using the empirical rule, what percentage of males in the town have a systolic blood pressure between 109 and 141?

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