I am absolutely stuck on this, can anyone assist, I keep getting the answer incorrect? Thank you!

In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained: 0.14, 0.09, 0.15, 0.17, 0.16, 0.11, 0.07. :1- Assuming that this sample is representative of the cars in use, construct a 98% confidence interval estimate of the mean amount of nitrogen-oxide emissions for all cars. If the EPA requires that nitrogen-oxide emissions be less than 0.165 g Imi, can we safely conclude that this requirement is being met