Here, we have a table of a probability mass function for the joint variables A and B. Some entries of the table are left blank, please find the value for the entry marked X. A B 10 20 30 40 PB 2 O a. 1/8 O b. 1/4 O c. 1/2 O d. 3/8 1 0 X : 2 1/8 0 0 0 1/8 e. None of the other values 3 0 0 1/8 1/4 4 0 *** 1/8 1/8 PA 1/8 3/8 1/8 3/8

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