An automotive center keeps tracks of customer complaints received each week. The probability distribution for complaints can be represented as a table or a graph, both shown below. The random variable xi represents the number of complaints, and p(xi) is the probability of receiving xi complaints.
|
xi
|
0
|
1
|
2
|
3
|
4
|
5
|
6
|
|
p(xi)
|
0.1
|
0.15
|
0.18
|
0.2
|
0.2
|
0.1
|
0.07
|
What is the average number of complaints received per week?
a) 2.12
b) 2.83
c) 3.32
d) 4.12