The output below is from a multiple linear regression analysis attempting to link winning percentage (y) to weekly practice time (x₁), average speed of first serve (x₂), and first serve percentage (x₃) using data from a group of 12 professional tennis players over the past year. Notice that some of the values in the table are missing.

a. Fill in the missing values indicated by (). 

b. Identify and interpret the estimated regression coefficients for x₁, x₂, and x₃.

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Regression Statistics Multiple R uare Adjusted R Sq Standard Error Observations 0.767 11.557 12 ANOVA df Regressiorn Error (Residual) Total 5226.547 Coeff Intercept avg serve speed (mph) weekly practice hours first serve % -58.050 0.418 1.806 0.419