Question 471534
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Hi
         So  Jr  Sr  T
males    6  10  2  18
females 10   9  3  22
Total   16  19  5  40
ONe chose:
 P(not a JR) = 21/40 
 P(Female or So) = (22 + 16 - 10)/40 = 28/40 = 7/10
 P( a male So or a female Sr) = (6 + 3)/40 = 9/40