An auto company claims that its new model has an average rating () of 33 mpg, and a population standard deviation () of 4 mpg. As a researcher of the R&D, you took 100 cars at random off the assembly line and found them to have a mean of 32 mpg. You found the 95% of the confidence interval (CI) is

1)31.22 mpg

2)32.78 mpg

3)between 31.22 mpg and 32.78

mpg

4) none of the above