demands for the product company product	Probability of this demand occurring	Rate of retrun 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

expected retrun

A stock retrun have the following shown above:

Calculate the stock's expected retrun, standard deiviation, and coefficient of variation