Let S be the educational attainment of individuals in a town, with values S=0 for less than high school and S=1 for high school or above. Also, let Y be their individual annual income with values Y=0 for less than $20,000, Y=1 for between $20,000 and $40,000, and Y=2 for above $40,000. Consider now the following joint probabilities: Y=0 (less than $20K) Y-1 ($20K-$40K) Y=2 (more than $40K) 0.03 0.01 0.36 0.33 S\Y S=0 (Less than HS) 0.05 S=1 (HS or more) 0.22 Determine the expected value (mean) of the conditional expected value of annual individual income (given the various levels of educational attainment).