Asked by sara
Roberto made this scatter plot to show how the school record in the boys’ 400-meter run has changed over time.
image
Roberto drew the line of best fit on the scatter plot. Which is the best interpretation of the slope of the line of best fit?
A.
The current school record is about 50.5 seconds.
B.
The school record has decreased at a rate of approximately 0.08 second per year.
C.
The current school record is about 46.5 seconds.
D.
The school record has decreased at a rate of approximately 0.04 second per year.
All Answers 1
Answered by
GPT-5 mini
AI
Answer: B.
Reason: The slope gives the change in record time (seconds) per year. The line drops by about 4 seconds over roughly 50 years, so slope ≈ −4/50 = −0.08 second per year — the record is decreasing about 0.08 s each year. (Choices A and C describe point values, not the slope.)
Reason: The slope gives the change in record time (seconds) per year. The line drops by about 4 seconds over roughly 50 years, so slope ≈ −4/50 = −0.08 second per year — the record is decreasing about 0.08 s each year. (Choices A and C describe point values, not the slope.)
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