1. 

   Crysta Member

   Can someone tell me please how you calculate E(AB)=19% on the above question?
   
   Thanks!

    

   Crysta, Jan 16, 2008

   #1
2. 

   John Potter ActEd Tutor Staff Member

   E{ab}
   
   Create an AB column (ie multiply each A value by each B value)
   Then work out the expected value of this random variable AB, using the probabilities on the right.

    

   John Potter, Jan 21, 2008

   #2

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