OG详解-OG7 数学2 Q12

Choice D is correct. A line in the xy-plane that passes through the points (x₁, y₁)  has a slope of  y₂−y1x₂−x1​​. The line of best fit shown passes approximately through the points (1, 3.3) and (7, 14.5). It follows that the slope of this best fit line is approximately 14.5−3.37−1​​ , which is equivalent to  11.26​​ , or approximately 1.87.   Therefore, of the given choices, 2 is closest to the slope of the line of best fit shown.
Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.