Ira S. answered 12/17/14
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The mode will probably be unaffected by the world class runner since none of the others will get the same time as him. So the mode will be unchanged.
Since the coach will get the lowest time, the median would not be affected if he ran .1 second less than the rest or 20 seconds less since the middle score would remain the same either way.
Bur the mean would be greatly effected by a difference of the times above. So the mean, or average, will be the most affected.
Hope this helped.