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making struct display chronologically

cscstudent1991 (6)
So I have a struct that intputs a external file and displays values. I'm trying to find a way to display each student in order from highest average grades to lowest.Can anyone help? I will show the external file and the struct I made so far.

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3313	90	42	58	64	70	75	100
5688	88	48	79	70	79	70	94
4700	50	44	89	73	70	73	100
9561	88	69	88	87	84	63	98
3199	96	69	100	90	88	67	100
3768	78	57	80	59	57	15	60
8291	72	56	70	82	74	9	83
7754	76	62	93	100	78	41	58
8146	94	68	99	94	93	9	54
2106	98	47	96	94	70	27	100


And here is the program...


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// File: stugrades.cpp
// Computes a external file and compiles it into a table with 3 columns of ID numbers, scores, and corresponding scores.

#include <iostream>  
#include <fstream> // re. ifstream object  
#include <iomanip> // re. setw, setprecision, fixed in formatted output 
 

    
using namespace std;

			

			struct examStats  

			{  
				string id;  
				int scores;  
				string grade;  
				float average;  
				float sum;  
			}; 


			
   
int main()
{  

	ifstream fin( "grades.txt" );   // construct ifstream object fin 

	if( fin ) 			// if opened ok ...  

	{  

		 

		string id; 
		string grade; 
		int count = 7;
		float average;
		string student;
		int mean = 72.8;
		examStats student_data[10];
		
		while( fin >> id )	//removed a >  
		{  

			
			int sum = 0, score[7];
			//int mean = 0, average[7];  

			for( int i = 0; i < 7; ++ i )  

		{  

			fin >> score[i];	// removed a >  

			sum += score[i]; 
					

			average = (sum / count); 

			
			student_data[0].id = id;
			student_data[0].scores = score[0];
			student_data[1].scores = score[1];
			student_data[2].scores = score[2];
			student_data[3].scores = score[3];
			student_data[4].scores = score[4];
			student_data[5].scores = score[5];
			student_data[6].scores = score[6];
			student_data[0].grade = grade;
			student_data[0].average = average;
			student_data[0].sum = sum;


  
			
			
		
				
				
					
				
					if (average > mean + 10)
					{
						grade = "outstanding";
					}
					else if (average < mean - 10)
					{
						grade = "unsatisfactory";
					}
					else if ((average <= mean + 10) && (average >= mean - 10))
					{
						grade = "satisfactory";
					}
				
		} 
			 

		cout << student_data[0].id << endl;
		cout << student_data[0].scores << " " << student_data[1].scores << " " << student_data[2].scores << " " << student_data[3].scores << " " << student_data[4].scores << " " << student_data[5].scores<< " " << student_data[6].scores << endl; 
		cout << student_data[0].average << endl;
		cout << student_data[0].grade << endl;
		cout << student_data[0].sum << endl;
        	cout << endl;

	}  

	fin.close(); // closes file  

	} 

}
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