We expect a car's highway gas mileage to be related to its city gas mileage (in miles per gallon, mpg). Data for all 12591259 vehicles in the government's 2019 Fuel Economy Guide give the regression line   highway mpg=8.720+(0.914×city mpg)highway mpg=8.720+(0.914×city mpg)   for predicting highway mileage from city mileage. (b) What is the intercept? Give your answer to three decimal pla

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