The production line of a car manufacturing company involves two major steps: (1) assembly of body and chassis and (2) interior assembly and painting. The amount of time it takes to finish step 2 is independent on the amount of time it took to finish step 1. The amount of time (in hours) to finish each production step for a typical sedan is illustrated in the PMF below:

Body and Chassis Assembly Interior Assembly and Painting 0.6 0.60 0.53 0.5 0.50 0.48 0.42 0.4 0.40 0.30 Probability 0.3 Probability 0.30 0.22 0.2 0.20 0. 1 0.05 0. 10 0 0.00 2 3 4 3 4 5 t (hrs) t (hrs)