1.)An owner of a fleet of taxis wants to estimate the mean gas mileage, in miles per gallon, of the cars in the fleet. A random sample of 40 cars is followed for one month, and the sample mean gas mileage is 23.2 with a sample standard deviation of 5.8. Construct and interpret a 90% confidence interval for the population mean gas mileage. 2. Noise level tests were done on a random sample of 40 new light rail vehicles (LRVs). The results of the tests gave a sample mean noise level of 65 decibels. Assume that it is known that the population standard deviation is 6 decibels. A.)Construct and interpret a 94% confidence interval for the population mean noise level. B.)Based on your answer to part (a), should you conclude that the new LRVs are quieter, on average, than the older-type trolley cars that had a mean decibel level of 80? Explain your