Ето едно примерно решение на Java. :D

import java.util.Scanner;

public class TrainTheTrainers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        double allGradesSum = 0;

        String input = scanner.nextLine();
        int countAllGrades = 0;
        while (!input.equals("Finish")){
            String presentation = input;
            double sumCurrGrade = 0;
            for (int i = 1; i <= n; i++) {
                double currGrade = Double.parseDouble(scanner.nextLine());
                sumCurrGrade += currGrade;
                countAllGrades++;
            }
            allGradesSum += sumCurrGrade;
            System.out.printf("%s - %.2f.%n", presentation, sumCurrGrade / n);
            input = scanner.nextLine();
        }
        double finalGrade = allGradesSum / countAllGrades;
        System.out.printf("Student's final assessment is %.2f.", finalGrade);
    }
}