VARX.P Returns the variance of the entire population.
Syntax
VARX.P(table, expression)
Parameters
table – Any DAX expression that returns a table of data.
Expression – Any DAX expression that returns a single scalar value, where the expression is to be evaluated multiple times (for each row/context).
Return Value
A number with the variance of the entire population.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference