Where is the problem?

Question

Arrays
https://code.sololearn.com/cWlZHwlXtR01/?ref=app

Answer 1

I think you are doing Element modify in line no.31 so use
ModifyElement2(X,1);
Instead of ModifyArray2(X,1);

Answer 2

The message is:

//يا رئوف

public class Scoresofstudents {
public static void main(String[] args) {

double [] X = {14,16,19,20,15};

System.out.format("n \t= %d\n",X.length);
System.out.format("Sum \t= %f\n",ArraySum(X));
System.out.format("Mean \t= %f\n",ArrayMean(X));

./Playground/Scoresofstudents.java:30: error: method ModifyArray2 in class Scoresofstudents cannot be applied to given types;
ModifyArray2(X,1);
^
required: double[]
found: double[],int
reason: actual and formal argument lists differ in length
1 error

That says what your problem is fairly well. You passed 2 parameters when only 1 is expected.

One solution is changing: ModifyArray2(X,1);
to: ModifyArray2(X);

The above change will solve your compilation error.