know number of data-missing row when making a summary table

[#1]

Hi all JMP experts,

I'm making a summary table from a raw data table - taking median by group names defined in column "purpose," e.g. a group is named "BSL."

The summary table shows that there are totally 744 rows of group "BSL" that are used for summary-extraction, but is there a way to know within the 744 data rows, how many rows contain/doesn't contain(i.e. missing) numbers?

[#2]

One of the statistics available in

     Tables=>Summary

is    N Missing

It will provide the number of missing rows within each group