A car company developed a certain car model to appeal to young consumers. The car company claims the average age of drivers of this certain car model is 27.00years old. Suppose a random sample of 19drivers wasdrawn, and the average age of the drivers was found to be 28.30years. Assume the standard deviation for the age of the car drivers to be 2.1years.

a.)The 95%confidence interval for the average age of the car driver has a lower limit of ___years old and an upper limit of _____years old.

(Round to two decimal places as needed.)