Answer:
// Program written in C++
// Comments are used to explain some lines
#include <iostream>
#include <iomanip>
using namespace std;
// Functions
void getData(double *, int);
void selectionSort(double *, int);
double getAverage(double *, int);
void displayData(double *, int, double);
int main() //Main Method
{
 double *ToTest, // To dynamically allocate an array
 Average; // To hold the average of the scores
 int Scores; // To hold number of scores
 // Get number of scores
 cout << "Number of average to find? ";
 cin >> Scores;
 // Allocate an array to number of scores
 ToTest = new double[Scores];
 getData(ToTest, Scores);
 selectionSort(ToTest, Scores);
 Average = getAverage(ToTest, Scores);
 printData(ToTest, Scores, Average);
 return 0;
}
//Get Data
void getData(double *ToTest, int Scores)
{
 cout << "Enter each scores.\n";
 for (int i = 0; i < Scores; i++)
 {
 do
 {
 cout << "Score #" << (i + 1) << ": ";
 cin >> *(ToTest + i);
 if (*(ToTest + i) < 0)
 {
 cout << "Scores must be greater than 0.\n"
 << "Re-enter ";
 }
 } while (*(Test + i) < 0);
 }
}
// Selection Sort
void selectionSort(double *ToTest, int Scores)
{
 int startscan, minIndex;
 double minValue;
 for (startscan = 0; startscan < (Scores - 1); startscan++)
 {
 minIndex = startscan;
 minValue = *(ToTest + startscan);
 for (int i = startscan + 1; i < Scores; i++)
 {
 if (*(ToTest + i) < minValue)
 {
 minValue = *(Test + i);
 minIndex = i;
 }
 }
 *(ToTest + minIndex) = *(ToTest + startscan);
 *(ToTest + startscan) = minValue;
 }
} 
// Calculate Average
double getAverage(double *ToTest, int Scores)
{
 double Total;
 for (int i = 0; i < Scores; i++)
 {
 Total += *(ToTest + i);
 }
 return Total / Scores;
} 
// Print Data
void printData(double *ToTest, int Scores, double Avg) 
{
 cout << "\n Test scores\n";
 cout << "Number of scores: " << Scores << endl;
 cout << "Scores in ascending-order:\n";
 for (int i = 0; i < Scores; i++)
 {
 cout << "#" << (i + 1) << ": " << *(ToTest + i) << endl;
 }
 cout << fixed << showpoint << setprecision(2);
 cout << "Average score: " << Avg << endl; 
}