Acompany with a large fleet of cars hopes to keep gasoline costs down and sets a goal of attaining a fleet average of at most 8.3 litres per 100 kilometres. to see if the goal is being met, they check the gasoline usage for 50 company trips chosen at random, finding a mean of 8.96 l/100 km and a standard deviation of 1.43 '100 km. is this strong evidence that they have failed to attain their fuel economy goal? complete parts a through e below.