double a[20]=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
b[20]=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
double sum=0,sm=0;
int i=0,j=0;
for(i=0;i<20;i++)
{
sum+=a[i];
}
sum/=20;
for(i=0;i<20;i++)
{
if(a[i] {
b[j]=a[i];
j++;
}
}
for(i=0;i{
sm+=b[i];
}
sm/=j;