Dax Calculation needed for matrix visual

I prefer to work with numbers, so, this might look a bit too complicated. Just took the following sample data:

From your logic, a would be staff, b,c,d wouldn't.

First: Transform these yes and no into numbers no = 0 and yes = 1, using calculated columns:

test1passint = IF(test1pass = "yes", 1, 0)

test2passint = IF(test2pass = "yes", 1, 0)

This gives this result:

Now you can transform text into sums, define the following measure:

isStaff = IF(SUMX(table, test1passint) = 1 && SUMX(table, test2passint) = 1, 1, 0)

Now placing all persons in a table and putting isStaff as a filter with 1 as its value, returns just a:

Define the following measure (I use __ to indicate I use variables in measures)

numbersstaff =

VAR __stafftable = SUMMARIZE(
          table,
           person,
           "member of staff",
            isStaff (the measure from above)
)

RETURN SUMX(__stafftable, __stafftable[member of staff])

This is like pregrouping the data for further calculations. Really helpful in case you wanna work just with raw data.