The manufacturer of a new suv model wants to determine which features of the current model its customers like. which population should the manufacturer sample to answer his questions?

It might be A).Owners of the SUV's manufatured by the company

Average rate of change over an interval =

(difference in value of the function between the
beginning and end of the interval)
       divided by
(length of the interval).

Example:

If the function was 200 pounds at the beginning, and 98 pounds 3 hours later,
then the average rate of change is  (98 - 200) / 3 = -34 pounds per hour.