On a cold February morning, the temperature of the radiator fluid in Stanley’s -18F car is . When the engine is running, the temperature of the fluid goes up 5.4F per minute. Approximately how long will it take before the radiator fluid temperature reaches 60F? 7.8 minutes 14.4 minutes 226.8 minutes 421.2 minutes

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