Call dbms_random.normal to get a random number
SQL> SQL> SQL> begin 2 for i in 1 .. 10 loop 3 dbms_output.put_line( dbms_random.normal ); 4 end loop; 5 end; 6 / 1.54614544732963133287654886045271895089 .4317388077546154281139738992526089097407 -.3932262942586239869251307222842090454052 -1.6670328488404622986050198363653775926 .6688556901515673452664296942201359807998 1.33788099021421741537616822012046180008 .4640589645668300518621566089428065420796 -.2593943569301190968371056213308217873704 -.928080380810723360417809948629051042821 .3610354349426925924563975682781230663073 PL/SQL procedure successfully completed. SQL> --