Example 2 If the variance of verbal GRE were 64,the variance of quantitative SAT were 81 and the correlation between these two tests were 0.50,then what is the variance of total SAT(verbal quantitative)?Example 2 • If the variance of verbal GRE were 64, the variance of quantitative SAT were 81 and the correlation between these two tests were 0.50, then what is the variance of total SAT (verbal + quantitative)? 7