u := 2.3cm;
t := 2pt;
m := 3;
h := m*0.1*u;

beginfig(1);
x1=-0.841621233573*u;
x2=-0.412463129441*u;
x3=0;
x4=0.841621233573*u;
x5=1.22652812004*u;
draw (-3u,0)--(3u,0);
draw (x1,0)--(x1,m*0.279961920408*u);
draw (x2,0)--(x2,m*0.366410331308*u);
draw (x3,0)--(x3,m*0.398942280401*u);
draw (x4,0)--(x4,m*0.279961920408*u);
draw (x5,0)--(x5,m*0.188035567009*u);
pickup pencircle scaled t;
draw
for i=-3 step 1/8 until 3:
	if i>-3:  ..  fi
	(i*u, m*((2.718281828459045**(-i*i/2))/2.50662827463)*u)
endfor
;
label.bot("3", (x1,0));
label.bot("3.5", (x2,0));
label.bot("4", (x3,0));
label.bot("5", (x4,0));
label.bot("5.5", (x5,0));
label("14%", (0.5[x1,x2],h));
label("16%", (0.5[x2,x3],h));
label("30%", (0.5[x3,x4],h));
label("9%", (0.5[x4,x5],h));
endfig;

bye