pleas solve those I will sure put like thank u very much

Q3: Calculate the Standard Deviation of the following assets A and B when probability is not given: Expected Return Year Asset A Asset B 2010 11% 14% 2011 8% 16% 2012 13% 12% Q4: Calculate the Coefficient of Variation (CV) for the following and which one should you select as investor? Year Asset SD Exp. Return A 15% 21% B 8% 15% 3% 6% WN