One stock's of Bisko Co., have the following distributions:
State of Probability of Rate of Return
Economy State of Occurrence
strong 0.2000 0.6000
semi-strong 0.2000 0.40000
normal 0.4000 0.1000
Weak 0.2000 -0.40000
What is the expected return of this stock?
What is the standard deviation of this stock?