Developers have built a small robotic vehicle that can travel over rough terrain. They recorded the time y, in minutes, that it takes to travel a fixed distance over various but similar terrains. For a fixed run, the robot's motor is set at a nominal speed x, in feet per second, but this varied from run to run.

(a) Plot the scatter diagram.
(b) Obtain the best fitting straight line and draw it on the scatter diagram.
(c) What proportion of the y variability is explained by the fitted line?

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