Create the DistrData data set. The DistrData data set contains the statistical information that PROC UNIVARIATE uses to create the histograms.

 data distrdata;
   drop n;
   label Normal_x='Normal Random Variable'
         Exponential_x='Exponential Random Variable';
   do n=1 to 100;
      Normal_x=10*rannor(53124)+50;
      Exponential_x=ranexp(18746363);
      output;
   end;
 run;