what effect ,if any did the 12 jurors personal background have on their decison? why is this question important when discussing a fair impartical jury?

All the jurors have some bias from their personal backgrounds. Some of these biases make their judgment more empathetic to the defendant and some make them aggressive towards the defendant. Juror number 3, for example, has a bad relationship with his own son, with whom he is no longer speaking to. Juror number three projects his own frustrations with his son on to the defendant. Juror number 8 is more objective and empathetic to the defendant. He votes not guilty and forces other jurors to re-examine their own biases.