Found below sentence from Answers.com : statistic: Definition from Answers.com
A numerical value, such as standard deviation or mean, that characterizes the sample or population from which it was derived.
If remove "from" from above sentence, does the meaning has any changes??
As in : A numerical value, such as standard deviation or mean, that characterizes the sample or population which it was derived.
In my opinion, it is the same without the "from" before "which", I cannot feel any changes of the meaning.
It is hard to understand if using "from/of which" or "from/of that", are all of this kind of phrases have the same usage like the above sentence?? Sometimes I will get confusing above it.
By the way, why "has any" should be deleted from "does the meaning has any changes" ??
Penny: the smallest unit of money in Britain of which there are 100 in a pound, or a small coin worth this much.
Can I rewrite the above sentence like below? As in:
Penny: the smallest unit of money in Britain which there are 100 of in a pound, or a small coin worth this much.
I still don't understand the usage of "of/from which/that", please guide me the correct way to use such words.