求sample701第二问详解！！！

evereally · 发表于 2012-2-22 10:56:47

[attachimg=975,444]96702[/attachimg]
第2问为什么是3倍啊？怎么来的？？

bumpup · 发表于 2012-4-30 12:33:47

楼主，想弱弱地问下，这题是哪里来的？

evereally · 发表于 2012-2-22 18:34:30

谢谢LS

babybearmm · 发表于 2012-2-22 14:09:26

Solution:

From the curve, we can read the approximate (age, mass) pairs:
(12, 900), (16, 3000), (20, 5100)

percent change of mass from the age of 12 to 16=(3000-900)/900 * 100%=2100/900 *100%
percent change of mass from the age of 16 to 20=(5100-3000)/3000 * 100%=2100/3000 *100%

So the ratio=3000/900~3

求sample701第二问详解！！！

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