You are considering purchasing two stocks with the following possible returns and probabilities of occurrence:

Investment A	Return	Probability of Occurence
	-10%	20%
	5	40
	15	30
	25	10
Investment B	Return	Probability of Occurence
	-5%	20%
	5	40
	7	30
	39	10

Which investment has a higher expected return [ Select ] ["Investment B", "Not enough information", "Equal expected returns", "Investment A"] ? Which investment has a higher risk according to standard deviation [ Select ] ["Same risk", "Not enough information", "Investment A", "Investment B"] ? I recommend you use a spreadsheet to answer this question. Which investment is more efficient [ Select ] ["Investment B", "Investment A", "Not enough information", "Equally efficient"] (higher return/risk ratio)?