You improve your time running a course by 5 seconds in week one, by 3 seconds in week two, and by 4 seconds in week three.
What is the average weekly change in your running time?
Answer (2)
m a − t h e a r i t m e t hi c a v er a g e m a = 3 5 + 3 + 4 = 3 12 m a = 4 s
The average weekly change in running time is found by adding the improvements over three weeks (5, 3, and 4 seconds), which totals 12 seconds. Dividing this total by the number of weeks (3), gives an average change of 4 seconds. So, the average weekly change in running time is 4 seconds.
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