Now only about "There is change in some people traditionally expected platinum to be an expensive metal, people are looking at it in the same terms as gold values,"

VOA: standard.2009.10.17

When you get--this is Rituparna, counting the leaves on a tree-- you can estimate, from a sample, the population expected values.

如果你...像数叶子的睿都巴若那一样,只有部分样本的话,你可以来估计总体均值

耶鲁公开课 - 金融市场课程节选