I need help with this question.

4. (10 points) (a) Of all cars on the interstate, 80% exceed the speed limit. What proportion of speeders might we see among the next 50 cars? Check the necessary conditions and describe the sample distribution. (b) Speeds of cars on a highway have mean 52 mph and standard deviation 6 mph, and are likely to be skewed to the right (a few very fast drivers). Describe what we might see in random samples of 50 cars