Data were recorded for a car’s fuel efficiency, in miles per gallon (mpg), and corresponding speed, in miles per hour (mph). Given the least-squares regression line, the natural log of open paren widehat Fuel Efficiency close paren is equal to 1 point 4 3 7 plus 0 point 5 4 1 ln Speed , what is the predicted fuel efficiency for a speed of 30 mph?