# static methods

Question 1

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.

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