Create a measure or dynamic virtual table based on slicer selection that returns table

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I've adjusted the calculation. Kindly review the attached file. The chart now aligns with Barcelona as expected in your results. I utilized MAX to capture the current value. The choice of MIN, SUM, or AVG would also suffice since we're dealing with a single value. The crucial aspect is employing an aggregation function to obtain the filter context value.

Below is the DAX calculation for NORM.DIST. It now specifically takes into account the current selection by using ALLSELECTED.

Norm.Dist = 
VAR __Mean = CALCULATE( AVERAGE(Sheet1[Age]) , ALLSELECTED( Sheet1 ))
VAR __StdDev = CALCULATE( STDEV.S(Sheet1[Age]) , ALLSELECTED( Sheet1 ))
VAR __Result =  NORM.DIST( AVERAGE( Sheet1[Age]) ,__Mean  ,__StdDev,FALSE())
RETURN
   __Result