A roll to roll manufacturing process has four stations: a printing station which takes a mean time of 3 minutes and a standard deviation of 1.0 minute, a coating station which takes a mean time of 2 minutes and a standard deviation of 0.6 minutes} a rinsing station which takes a mean time of 2 minutes and a standard deviation of 0.5 minutes, and an oven (heating station) which takes a mean time of 6 minutes with a standard deviation of 0.4 minutes. From there the roll is taking to be cut and converted into the nal product. To make a particular product1 the roll is rewound through the rinsing and heating station twice (meaning it is rinsed and dried a total of three times). What is the mean and variance of the time it takes to produce a nished roll before it goes to the die cutter