Answer below questions based on the table 1. what each portfolio represents? 2. how RETp is calculated for different portfolios? 3. what way the portfolios overlap? 4. why the variance of RETp is different across portfolios? Analysis Variable : RETp Return on Portfolio Portfolio N Obs N Mean Variance Minimum Median Maximum PORTOS 60 60 0.0128577 0.0033785 -0.1655639 0.0176755 0.2272955 PORT10 60 60 0.0111060 0.0016358 -0.0921494 0.0135465 0.1585073 PORT30 60 60 0.0072709 0.0016772 -0.0954197 0.0074651 0.1584965 PORT50 60 60 0.0068887 0.0020275 -0.1109692 0.0093087 0.1663502 PORTmkt wwwwwwwwwww 60 60 0.0086981 0.0012137 -0.0848728 0.0102946 0.1139823