The winning time for a race displayed in the table would be:
A). The winning time increased by an average of 0.4 seconds per year from year 2 to year 4.
Find the increase in winning time:
Given that,
Year               Winning Time(seconds)
1 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 27.5
2 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 28.4
3 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 28.7
4 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 29.2
5 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 29.44
The total change in the time = (0. + 0.3 + 0.5 + 0.24)/4
= 0.485 seconds
If we round off, it becomes 0.5 seconds.
Therefore, it can be considered that an average of 0.5 seconds changes every year from year 2 to 4.
Thus, option A is the correct answer.
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