#include <bits/stdc++.h>

 using namespace std;

 int    n,m;

 long double    a[];

 long double    POW(const long double t,int b)

 {

     long double    r=,base=t;

     while(b)

     {

         if(b&)r*=base;

         base*=base;

         b>>=;

     }

     return r;

 }

 long double    Calc1()

 {

     long double    temp=;

     for(int i=;i<=n;++i)temp+=a[i]*a[i];

     return (double)m*(m-)*temp+m;

 }

 long double    Calc2()

 {

     long double    temp=;

     for(int i=;i<=n;++i)temp+=POW(-a[i],m);

     return (double)n-temp;

 }

 int main()

 {

     int    i;

     int    Sum=;

     scanf("%d%d",&n,&m);

     for(i=;i<=n;++i)scanf("%Lf",&a[i]),Sum+=a[i];

     for(i=;i<=n;++i)a[i]=a[i]/Sum;

     printf("%.2Lf\n%.2Lf\n",Calc1(),Calc2());