係standard deviation條式到睇到一個類似以下既符號:
______
\ | N
\
/
/_____| i = 1
想問下呢個符號係咩意思 同埋N同i點解?
收錄日期: 2021-04-15 17:47:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20141231000051KK00019