Standard Deviation of calculated Column / measure STDEV.P is not working

[chamsudhir]

Greetings for the day,
I want to calculate the standard deviation for the whole month day wise data for that I created a calculated measure.

Please find the details.

Measure:

Result:

After placing the measure in table it is showing the values 0.00. Kindly sort out the Issue. Appreciate for giving me the exact solution.