percentile calculation

I put that comment in for the post only...(but I didn't recall the // syntax for a comment in the code, so thanks!)

The error message reads as below which didn't help me much.  I was surprised it said Median is incorrect--so thought that perhaps the UpperMiddle was fine?  Anyway, here it is...

The syntax for 'Median' is incorrect. (DAX(

Var UpperMiddle = PERCENTILE.EXC([TotalProfitMargin], 0.75)
VAR Median = PERCENTILE.EXC([TotalProfitMargin], 0.50)
VAR LowerMiddle = PERCENTILE.EXC([TotalProfitMargin], 0.25)
RETURN

SWITCH (
TRUE(),
[TotalProfitMargin] > UpperMiddle, "Q1",
[TotalProfitMargin] > Median, "Q2",
[TotalProfitMargin] > LowerMiddle, "Q3",
"Q4")
)).