Question: A volunteer ambulance service handles zero to three service calls on any given day. The probability distribution for the number of service calls is as follows:
X: the number of service calls Probability
0 .15
1 .25
2 .40
3 .20
(i) What is the mean number of service calls per day
(ii) What is the variance of the number of service calls?
(iii) What is the standard deviation of the number of service calls?
(iv) Compute the coefficient of variation of the number of service calls.