Easiest method to add a mean output in search and sort code?

Tried a couple ways but can't seem to get it to compile. Any recommendations on implementing said function?

#include "stdafx.h"
#include <string>
#include <iostream>
#include <vector>

using namespace std;
void bubble_sort(vector<int>&);

int main()
{
// binary Search Variables and vector
int beg, end, mid, item;
string choose = "y";
vector<int> binNums;

//Bubble sort variables and vector
int num, val;
vector<int> bbSort;

//Bubble sort block
cout << "Enter the number of elements : ";
cin >> num;
for (int i = 0; i < num; i++) {
cout << "Enter the element " << i + 1 << ": ";
cin >> val;
bbSort.push_back(val);
}

bubble_sort(bbSort);

cout << "List of sorted elements: " << endl;
for (int i = 0; i < num; i++) {
cout << bbSort[i] << " ";
}
cout << endl;

//Binary search block
binNums = bbSort;
while (choose == "y")
{
cout << "\nEnter Item you want to Search: ";
cin >> item;

beg = 1;
end = num;

mid = (beg + end) / 2;

while (beg <= end && binNums[mid] != item)
{
if (binNums[mid]<item)
beg = mid + 1;
else
end = mid - 1;

mid = (beg + end) / 2;
}

if (binNums[mid] == item)
{
cout << "\nElement found at location : " << mid + 1 << endl;
}
else
{
cout << "Element not found";
}

cout << "Do you want to search for another Item(y OR n)? ";
cin >> choose;
}
return 0;
}

void bubble_sort(vector<int>& a)
{
for (int i = a.size(); i > 0; i--)
{
for (int j = 0, k = 1; k < i; j++, k++)
{
if (a[j] > a[k])
{
int swap = a[j];
a[j] = a[k];
a[k] = swap;
}
}
}
}
It compiles with Visual Studio 2015 CE and and works fine.
Currently it does but I'm trying to add a function which calculates the mean of the user defined/inputted array.
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