Resolução

public class Main {

    public static void main(String[] args) {
        Movie myMovie = new Movie();
        myMovie.name = "The Godfather";
        myMovie.release = 1972;
        myMovie.runningTime = 175;
        myMovie.included = true;

        myMovie.showProductionCredits();
        myMovie.rate(7.6);
        myMovie.rate(9);
        myMovie.rate(10);
        System.out.println(myMovie.rating);
        System.out.println(myMovie.totalrating);
        System.out.println(myMovie.getAverage());
    }
}


   public class Movie {
   
    String name;
    int release;
    boolean included;
    double rating;
    int totalrating;
    int runningTime;

    void showProductionCredits(){
        System.out.println("Movie: " + name);
        System.out.println("Release: " + release);
        System.out.println("Running time: " + runningTime);
        System.out.println("On your signature: " + included);
    }

    void rate(double rate){
        rating += rate;
        totalrating++;
    }

    double getAverage(){
        return rating/totalrating;
    }

}