A random sample is selected from a population with mean = 102 and standard deviation = 10. For which of the sample sizes would it be reasonable to think that the x sampling distribution is approximately normal in shape? (Select all that apply.)

n = 14

n = 17

n = 43

n = 65

n = 130

n = 52

Emissions of nitrogen oxides, which are major constituents of smog, can be modeled using a normal distribution. Let x denote the amount of this pollutant emitted by a randomly selected vehicle (in parts per billion). Suppose the distribution of x can be described by a normal distribution with = 1.6 and = 0.3.

Suppose that the EPA wants to offer some sort of incentive to get the worst polluters off the road.What emission levels constitute the worst 10% of the vehicles? (Round your answer to three decimal places.)The worst 10% of vehicles are those with emission levels ( equal to, less than, greater than) ____ parts per billion.