The information below shows the number of emergency calls to an ambulance service in the last day. Use this table to answer question 6 and 7.

Number of Calls	Frequency	Probability, P(x)
0	8
1	10
2	22
3	4
4	1

6. What is the expected number of calls on any given day?

a. 1.42

b. 1.92

c. 2.42

7. What is the standard deviation of the number of calls on any given day?

a. 1.634

b. 1.482

c. 1.278