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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 school record has decreased at a rate of approximately 0.08 second per year.
B.
The current school record is about 50.5 seconds.
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.
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A.
The slope is negative, so the record (time in seconds) is decreasing over years. The slope gives change in seconds per year, and the line of best fit falls by about 0.08 second for each year — choice A.
The slope is negative, so the record (time in seconds) is decreasing over years. The slope gives change in seconds per year, and the line of best fit falls by about 0.08 second for each year — choice A.
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