Morti maschi per incidenti stradali nel 1922 a Londra in fasce di eta'.

Sull'asse verticale è rappresentata la frequenza percentuale unitaria (o densità)
On the y axis, the unitary percentage frequency (or density) is represented
(that is the percentage frequencies divided by the amplitude of each interval).
You can round mean (taking into account the width of the intervals).

Puoi aprire il codice e modificare la funzione: vedi l'Help
You can open the Code and modify the function: see the Help
HELP

```// I: estremi degli intervalli, P: frequenze
I=[0,   5,  10,  15, 20,  30,  40,  50,  60,  70, 80,  100]
P=[ 120, 184,  44, 24,  23, 50,  60,  102, 167, 150, 49]; NP=P.length
SUM=0; for(i=0;i<NP;i=i+1)  {SUM=SUM+P[i]}
mean=0; for(i=0;i<NP;i=i+1) {mean=mean+P[i]*(I[i]+I[i+1])/2}; mean=mean/SUM
Tot=0; for(i=0;i<NP;i=i+1) {Tot=Tot+P[i]}; for(i=0;i<NP;i=i+1) {P[i]=P[i]/Tot/(I[i+1]-I[i])}
LLx=[]; j=0; for(i=1;i<=NP;i=i+1) { LLx[j]=I[i-1]; LLx[j+1]=I[i-1]; LLx[j+2]=I[i]; LLx[j+3]=I[i]; j=j+4 }
LLy=[]; j=0; for(i=1;i<=NP;i=i+1) { LLy[j]=0; LLy[j+1]=P[i-1]; LLy[j+2]=P[i-1]; LLy[j+3]=0; j=j+4 }

aX = 0; bX = 100; aY = 0; bY = 5/100
Dx = 10; Dy = 0.5/100
XX=[50]; YY=[1/100,2/100,3/100,4/100]

...
yy=YY; xx=XX
Q1x=[mean]; Q1y=[0]
C1="black"
L1x=LLx; L1y=LLy
...
AX=BX=AY=BY=""
BY = "Tot="+Tot;  AY = "mean~"+mean
AAX=aX; BBX=bX; AAY=aY; BBY=bY
...
Co1="lightgrey"
...
Cgr2="violet"; yy1=yy

```