You hold an equally-weighted (half invested in each) portfolio consisting of two stocks A and B, whose returns for the past three years are given below. Year 2018 2019 2020 Stock A 24% -4% 10% Stock B -2% 26% 12% What are the average return and standard deviation of your portfolio AB? Average return is %, standard deviation is %. Round your answer to a whole number, e.g., x or xx. (Hint: Think of portfolio return each year.)