Use the subsequent scenario to answer the next three questions. A volunteer ambulance service handles 0 to 5 service calls on any given day. The prospect distribution for the number of service calls is as follows.
Number of service calls probability
0 .10
1 .15
2 .30
3 .20
4 .15
5 .10
Explain what is the expected number of service calls?
Explain what is the variance in the number of service calls?
Explain what is the standard deviation?