Question attempt

//Q3_reverseSortDemo
public class Q3_ReverseSortDemo {
    public static void main(String[] args){
        char[] unorderedLetters;
        unorderedLetters = new char[]{'b', 'm', 'z', 'a', 'u'};
        reverseSort(unorderedLetters);
        for (int i = 0 ; i < unorderedLetters.length; i++ )
            System.out.print(unorderedLetters[i]);
    }

    //method that sorts a char valuesay into its reverse alphabetical order
    public static void reverseSort(char[] values){
        //your code here
        int n = values.length;
        char temp;
         for(int i=0; i < n; i++){
                 for(int j=1; j < (n-i); j++){
                          if(values[j-1] > values[j]){
                                 //swapping elements
                                 temp = values[j-1];
                                 values[j-1] = values[j];
                                 values[j] = temp;
                         }

                 }
         }
    }
}
//Q6
import java.util.Scanner;
public class Q6{
    public static void main(String[] args){

        //your code here
    System.out.print("Input 10 students grades: ");
    Scanner scanName = new Scanner(System.in);
    double[] myDouble = scanName.nextDouble();
    System.out.print(calculateAverage(myDouble));
    System.out.print(calculateMedian(myDouble));
    System.out.print(calculateNumberFailed(myDouble));
    System.out.print(calculateNumberPassed(myDouble));

    }

    public static double calculateAverage(double[] notes){
        //your code here
        double result;
        double total = 0;
        for(int i = 0; i <= notes.length-1; i++){
            total = total + notes[i];
        }
        result = total/notes.length;
        return result;
    }

    public static double calculateMedian(double[] notes){
        //your code here
        double median;
        double medianPosition=notes.length/2;
        median = notes[medianPosition];
        return median;
    }

    public static int calculateNumberFailed(double[] notes){
        //your code here
        double failed = 0;
        for(int i = 0; i <= notes.length-1; i++){
            if(notes[i]<=50){
                failed=failed+1;
            }
        return failed;
        }
    }

    public static int calculateNumberPassed(double[] notes){
        //your code here
        double passed = 0;
        for(int i = 0; i <= notes.length-1; i++){
            if(notes[i]>=50){
                passed=passed+1;
            }
        return passed;
        }
    }

}