Problem-2 A volunteer ambulance service handles 0 to 5 service calls on any given day. The proba- bility distribution for the number of service calls is as follows. Number of Service Calls Probability Number of Service Calls Probability 0 .10 3 .20 l .15 4 .15 2 .30 5 .IO a. What is the expected number of service calls? b. What is the variance in the number of service calls? What. is the standard deviation