(Solved): Suppose that a researcher, using data on class size \( (C S) \) and average test scores from 104 t ...

Suppose that a researcher, using data on class size \( (C S) \) and average test scores from 104 third-grade classes, estimates the OLS regression \( \widehat{\text { TestScore }}=509.992+(-5.7036) \times C S, R^{2}=0.09, S E R=11 \) A classroom has 20 students. The regression's prediction for that classroom's average test score is . (Round your response to two decimal places.)