Suppose that a researcher, using data on class size (cs) and average test scores from 105105 third-grade classes, estimates the ols regression modifyingabove testscore with caret equals 562.032 plus (negative 6.2856 )times cs comma upper r squared equals 0.10 comma ser equals 12.4testscore=562.032+(−6.2856)×cs, r2=0.10, ser=12.4. a classroom has 2020 students. the regression's prediction for that classroom's average test score is