Calculate the stocks expected return standard deviation and

Question

A stock's return has the following distribution       

Demands for Company's Products    Probability of this Demand Occurring Rate of Return if this demand occurs   

Weak 0.1 (30%)

Below Average 0.1 (14)

Average 0.3 11

Above Average 0.3 20

Strong 0.2 45

1.0

Calculate the stock's expected return, standard deviation, and coefficient of variation.