THIS APPENDIX LISTS FUNCTIONS available in DAX along with their syntax.
Statistical functions aggregate and compute data, returning a scalar value. Usually, these functions operate on all the rows of the table containing the specified column, which has to be of numeric or date type. The A suffix identifies functions that also operate on any other type of columns. The X suffix identifies functions that allow aggregation of the result of an expression applied to each row of the specified table.
Table A-1. Statistical Numeric Functions Returning a Scalar Value
AVERAGE( <column> )
Returns the arithmetic mean of all the numbers in a column. <column> must be of date or number type. ...