RapidTables
Calculates Average/Median/Mode/Standard deviation:
* SD = standard deviation
Weighted average calculator ►
The average (arithmetic mean) is equal to the sum of the n numbers divided by n:
Average = (a1+a2+...+an) / n
The average of 1,2,5 is:
Average = (1+2+5) / 3 = 2.667