Input and file implementation not working

Here is the input case for my files :
#include "Person.cpp"

#include <cmath>

const double EPS = 0.00001;



Person a("alice", 92);

Person b("bernice", 77);

Person array[] = {a,b};

double result = stdDev(array, 2);

ASSERT_TRUE(fabs(result-7.5) < EPS);


**********************Below are my separate CPP and HPP files for the function. When i use my own main the function works but the above input does not. thoughts?


--------------------------------Person.hpp----------------------------
#ifndef MY_PERSON
# define MY_PERSON
#include<iostream>
using namespace std;
class Person
{
int age;
string name;

public:

// constructor
Person();

// constructor
Person(string, int);

// getter methods

string getName();

int getAge();
};
#endif
---------------------------------------------------Peron.cpp--------------------------------------------------------------
#include "Person.hpp"
// constructor
Person::Person()
{
name = "";
age = 0;
}
// constructor
Person::Person(string n, int a)
{
name = n;
age = a;
}
// getter methods
string Person::getName()
{
return name;
}
int Person::getAge()
{
return age;
}
-------------------------------------------------stdDev.cpp-----------------------------------------------
#include "Person.cpp"
#include<cmath>
double stdDev(Person arr[], int n)
{
double mean = 0.0, sum = 0.0;
int i;

// get the total of age of all person
for( i = 0 ; i < n ; i++ )
{
sum += (double)arr[i].getAge();
}

// calculate mean
mean = sum / (double)n;

double temp_sum = 0.0;

for( i = 0 ; i < n ; i++ )
{
temp_sum += pow(arr[i].getAge() - mean, 2);
}

// calculate standard deviation
double sd = sqrt(temp_sum / (double)(n - 1));

return sd;
}
-----------------------------------------------------main.cpp---------------------------------------------------------
#include "stdDev.cpp"
int main()
{
Person *arr = new Person[6];

arr[0] = Person("Monica Geller", 28);
arr[1] = Person("Chandler Bing", 32);
arr[2] = Person("Ross Geller", 38);
arr[3] = Person("Rachel Green", 23);
arr[4] = Person("Joeseph Tribianni", 42);
arr[5] = Person("Phoebe Buffay", 17);

double sd = stdDev(arr, 6);

cout<<"Standard Deviation : "<<sd;

return 0;
}
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