Jennifer order 5 pairs of shoes online. all shoes were the same price and she paid $375 which included shipping. choose the statements below that could be true.

a. if shipping cost $30, each pair of shoes cost $77.00

b. if shipping cost $40, each pair of shoes $67.00

c. if shipping cost $50, each pair of shoes cost $65.00

d. if shipping cost $60, each pair of shoes cost $70.00

e. if shipping cost $70, each pair of shoes cost $61.00

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