Suppose iq scores were obtained from randomly selected twins. for 20 such pairs of people, the linear correlation coefficient is 0.837 and the equation of the regression line is (bar of)y-6.87 + 0.91x, where x represents the iq score of the twin born second. also, the 20 x values have a mean of 99.54 and the 20 y values have a mean of 97.75. what is the best predicted iq of the twin born first, given that the twin born second has an iq of 93?