If there is a 20% chance we will get a 15% return, a 30% chance of getting a 12% return, a 40% chance of getting a 8% return, and a 10% chance of getting an 10% return, what is the expected rate of return? (show work)

The standard deviation for the above investment would be: (show work)

The coefficient of variance for the above investment would be: (show work)