1.preston inc. stock has a 20%chance of producing a 45% return, a 50% chance of producing a 9% return, and a 30% chance of producing a -28% return. what is the firm's standard deviation of return

2. microsoft annual stock returns for the last five years are: 20.79%, 40.75%. 15.07%, 22.69% and 27.58% what is microsoft coefficient of variation for this time period