double function ( ) { return mean ; }
get the arithmetic mean of the aggregate statistics concode_field_sep long min concode_elem_sep long max concode_elem_sep double m2 concode_elem_sep double mean concode_elem_sep long sum concode_elem_sep String operation concode_elem_sep int n concode_field_sep void add concode_elem_sep void add concode_elem_sep double getDeviation concode_elem_sep double getVariance concode_elem_sep void reset concode_elem_sep String toString concode_elem_sep int getCount concode_elem_sep long getSum