Question

A salesman wants to know the average number of units he sells per sales call. He checks his past records and comes up with the following probabilities:

Sales (in units):

0

1

2

3

4

5

Probability:

0.15

0.20

0.10

0.05

0.30

0.20

What is the average number of units he sale call?

Solution

Correct option is

2.75

Let X denotes the number of units. Then, X is a random variable with the following probability distribution

xi:

0

1

2

3

4

5

pi:

0.15

0.20

0.10

0.05

0.30

0.20

                                                                                     

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