One internet service provider has the following rate schedule for high speed internet service
monthly service charge- 18.00
1st 50 hours of use- free
next 50 hours of use- 0.25/hour
over 100 hours of use 1.00/hour
what is the charge for 135 hours of high speed internet use in one month?

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