Need Help ?
Have a Question ?

(Solved): The Highway Fuel Economy Of A 2016 Lexus RX 350 FWD 6-cylinder 3.5-L Automatic 5-speed Using Premium ...

The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of ? = 21.50 mpg and a standard deviation of ? = 2.75 mpg.

(a) What is the standard error of X¯¯¯X¯ , the mean from a random sample of 9 fill-ups by one driver? (Round your answer to 4 decimal places.)
Standard error of   X¯¯¯X¯             

(b) Within what interval would you expect the sample mean to fall, with 95 percent probability? (Round your answers to 4 decimal places.)
The interval is from  to

Expert Answer

We have an Answer from Expert Buy This Answer $6