8.19. According to Boeing's website, average fuel consumption of a Boeing 747' is 0.2 mpg. A random sample of 45 Boeing T4? aircrafls are selected and their average fuel consumption is 0.21 mpg with a standard deviation of 0.0? mpg. Is there evidence to show that the average fuel consumption of a Boeing 7'47 is different from 0.2 mpg? Perform all the steps of a hypothesis test at the 5% significance level