The summary sheet previously showed that the expected value of X_p was conditional on X_L being greater than d.  This conditioning should have been either X_L >0 or X>d.  I’ve corrected it to say X_L>0.  This also affected one flashcard from C.3.6.  I have that corrected in the flashcard app.  Please change it by hand if you have already printed out printable flashcards.