Use the Following Information for Questions

Short Answer

Use the following information for questions:
The level of nitrogen oxides (NOX) in the exhaust of a particular car model can be modeled by the normal distribution with mean 0.9 grams per mile and standard deviation of 0.16 grams per mile. A random sample of 4 of these NOX levels is to be selected.
-What is the probability that the NOX level of all 4 cars in the sample is greater than 1 gram per mile?