Assume the average age of a registered vehicle is 72 months or 6 years. Assume the standard deviation is 12 months
a.) A vehicle is selected at random, find the probability that it is MORE than 80 months old. Round your answer to four decimal places.
b.) If a random sample of 32 vehicles is selected, find the probability that the mean of their age is MORE than 80 months. Round your answers to four decimal places.