Problem 2 The time required to assemble a piece of machiner

Problem # 2 The time required to assemble a piece of machinery is a random variable having approximately a normal distribution with mu = 12.9 minutes and sigma = 2.0 minutes. What are the probabilities that the assembly of a piece of machinery of this kind Will take (a) at least 11.5 minutes; (b) anywhere from 11.0 to 14.8 minutes.

Solution