Here is the program to do std normal, t1 t5 and t30.

Note: t -- distribution with df=1 is cauchy distribution that has very heavy tails( No any order of moments exist)

Hope yuo can do the rest to prove that your are NOT 脑残了.

data t1;
   do x=-10 to 10 by 0.1;
     pdf_n=pdf('normal', x,0,1);
     pdf_t1=pdf('t', x,1);
     pdf_t5=pdf('t', x,5);
     pdf_t30=pdf('t', x,30);
     output;
    end;
run;

symbol i=j c=red;   
symbol2 i=j c=black;
symbol3 i=j c=green;
symbol4 i=j c=orange;
proc gplot data=t1;
  plot (pdf_n  pdf_t1 pdf_t5 pdf_t30) *x /overlay;
  run;
  quit;

bobguy确实厉害啊
学习啊

非常感谢，学习了。

学习了，非常感谢！

一楼简直是牛！！