in java please

2. (a) Write a function double getAverage (int n, int []x ) that given an array and its dimension computes and returns the average value of all the elements of the array. (b) Similarly, write a function double getstandardDev(int n, int [ ] x ) that computes and returns the standard deviation. (c) Write a function called int getMaximum (int n, int[] x ) that given an array and its dimension computes and returns the maximum value