Mean of 11, 10, 12, 12, 9, 10, 14, 12, 9 is ______ .
20
14
11
10
The given observations are 11, 10, 12, 12, 9, 10, 14, 12, 9.
If mean of and is 11, find the mean of first three observations.
The arithmetic mean of 25 and 11 is ________