The scatterplot above displays the marathon times of the eight members of a running club in relation to their ages and the line of best fit. How many people have times at least fifteen minutes faster than what would be expected based on the line of best fit?
A. One
B. Two
C. Three
D. Four
Answer:C
The scatterplot above displays the marathon times of the eight members of a running club in relation to their ages and the line of best fit. How many people have times at least fifteen minutes faster than what would be expected based on the line of best fit?
A. One B. Two C. Three D. Four
Explanation: C The 36-year-old runner ran under 3:00:00 when almost 3:30:00 is expected. The 39-year-old runner ran slightly above 3:00:00 when 3:30:00 is expected. The 41-year-old runner ran slightly above 3:00:00 when about 3:45:00 was expected. Therefore, three runners ran at least 15 minutes faster than predicted, which matches (C). If you chose (B), you may have based your choice on the number of runners who ran more than 15 minutes slower than their predicted time.