Ononot — A scatter plot of N=10 data points yields \sum xi = 20, \sum

Data Visualizationhard

0:00.0

A scatter plot of $N=10$ data points yields $\sum x_i = 20$ , $\sum y_i = 50$ , $\sum x_i^2 = 60$ , and $\sum x_i y_i = 120$ . What is the slope $b_1$ of the OLS regression line?