TCO 1: Probability of more than 21 hours to make 1000 gallons of synthetic rubber?
(TCO 6) The time required to make 1000 gallons of synthetic rubber at a plant in South America in a recent year was normally distributed with a mean of 18 hours and a standard deviation of 2.5 hours. What is the probability that it will take more than 21 hours to make 1000 gallons of synthetic rubber? 1.2 0