Most commonly used measure of central tendancy is:
MEAN 

Most commonly used in biostatistics.
Most of the value in data spread along the mean.

MEDIAN

BETTER indicator of central tendency
Maximum observation are concentrated around median
If EXTREME VALUEs are recorded, then mean can’t be used. Use median. .

MODE 

Rarely used. A series can have – no mode, 1 mode or, multiple mode.
Mean
Median
Mode
None of the above