Posted by Kassie on Monday, February 1, 2010 at 8:08am.
Draw your Venn Diagram
My drawing shows that
Note:
Pr(Junior or Psy)= Pr(Jun)+ Pr(Psy)-Pr(Junior AND Psy)
But you are given Pr (NOT(Junior Or Psy), so Pr(Junior or Psy)=1-Pr( Not(junior or Psy).
Finally, then
Pr(Junior ANd Psy)=Pr(Jun)+Pr(Psy)-Pr(Jun or Psy)
= Pr(Jun)+ Pr(Psy)-(1-Pr(NOT(Jun or Psy))
= 13/50 + 20/50-1+24/50
=57/50-1= 7/50
so 7 Psy majors are Juniors.
check my thinking.
This is not physics. Please dont misrepresent your subject again.
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