Referensi : Apakah Rerata dari Sekumpulan Rerata Valid ?

Status : Draft

Coba lihat weighted average [3]

Referensi

1. Averaging Averages, http://mathforum.org/library/drmath/view/52790.html
2. The average of averages is not the average, http://lemire.me/blog/2005/10/28/average-of-averages-is-not-the-average/ 
3.  Why is an average of an average usually incorrect?, http://math.stackexchange.com/questions/95909/why-is-an-average-of-an-average-usually-incorrect