Write static methods as follows:

double sum(double[] a) returns the sum of the entries in the array a.

double[] fill(int n, double v) returns an array of n doubles, all of whose values are v.

double[] random (int n) return an array of n random doubles.

double min(double[] a) returns the minimum element of the array a.

double max(double[] a) returns the maximum element of the array a.

double average(double[] a) returns the average (or mean) of the elements of the array a.

double variance(double[] a) returns the variance of the elements of the array a(note: this

method should call your average method).

double stdDev(double[] a) returns the standard deviation of the elements of the array a (note:

this method should call your variance method).

double[] read() reads an array from the keyboard and returns it (read the number of elements

first, and then that many numbers).

void print(double[] a) prints an array, a, on a single line with commas between elements (do

NOT use Arrays.toString()).

Write a Main class with a main method that tests your methods appropriately (i.e. by calling each method at least once with various inputs), and printing the results.