Question

95-85-닚Time (seconds)a01120 140 160 180 200Weight (pounds)Nineteen people ran 400 meters. Each point on the scatterplot above represents a person's time (inseconds) to complete the run and the weight (in pounds) of that person. The scatterplot also shows a lineof best fit for the data. According to the graph, each increase of 8 pounds in a runner's weight tends toincrease the runner's time by approximately how many seconds?2.002.53.03.54.0

Answer 1

The best fit line passes throug the points (120,65) and (200,90).

Determine the slope of best fit line.

$\begin{gathered} m=\frac{90-65}{200-120} \\ =\frac{25}{80} \end{gathered}$

So for unit increase in weight time increase by 25/80 se