a) When we use the tool of Standard deviation and Co-efficient of Variance? Is there any exceptions while using these tools to conduct return analysis of any specific portfolio?

b) Some Investor accept high risk investments and some investors prefer low risk investments. What type of situation is this? Suppose that you are highly risk averse but that you still invest in common stocks. Would the betas of the stocks you invest in, be more than or less than 1.0? Why?