Solve stochastic independence four-field table?

stochastic independently means: P(A n B) = P(A) * P(B)

here: (I) 0,12=P(A) * P(B) and (II) 0,32=P(A-Strich)*P(B-Strich)

and it always applies: P(A-Strich)=1-P(A), also with B

Now use this in the second equation for the P’s and you can solve the equation system.

If you know P(A) and P(B), you can easily fill the complete four-field panel.