Every morning, Halle goes to school with a 1- liter bottle of water. She drinks 1/4 of the bottle before school starts and 2/3 of the rest before lunch. What fraction of the bottle does Halle drink after school starts but before lunch?

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