In the first month, Hare took 10 chapter tests; Tortoise took only 2. In the second month, Hare took his remaining 2 exams and Tortoise took the 10 he needed to finish.
Hare's average = (10*60 + 2*90) / 12 = 780/12 = 65
Tortoise's average = (2*50 + 10*80)/12 = 900/12 = 75
Mathematicians know this as Simpson's paradox.
I have absolutely no idea what Simpson's paradox is.
But it's okay, because I'll research it soon. :D
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