A machine used to paint white lines on a road uses 250 litres of paint for each 8 km of road marked. Calculate: a) how many litres of paint would be needed for 200 km of
b) what length of road could be marked with 4000 litres of
road.

What situation is an example of an observational study

The difference between tax advoidance and tax evasion

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297