A collision repair department has 3 body repair workers and 2 painters to be properly staffed. The joint probability model for body repair (x) and painters (y) working at any specific time is given below; x=0 x=1 x=2 x=3 y=0 0.01 0.03 0.02 0.01 y=1 0.05 0.10 0.10 0.10 y=2 0.10 0.15 0.15 0.18 What is the expected number of total staff working at any specific time? a. 2.79 b. 2.91 c. 1.75 d. 3.05 e. 3.20