java - calculating average of random integers in an array -


i need generate specified number of random integers between 2 values specified user (example, 12 numbers between 10 , 20), , calculate average of numbers. problem if ask generate 10 numbers, generate 9 (shown in output.) also, if enter max range of 100 , min range of 90, program still generate #'s 147, etc on max range... did mess random number generator? can help?

here code have far: 

public class arrayrandom { static console c;           // output console  public static void main (string[] args) {     c = new console ();     decimalformat y = new decimalformat ("###.##");      c.println ("how many integers generate?");     int n = c.readint ();      c.println ("what maximum value these numbers?");     int max = c.readint ();     c.println ("what minimum value these numbers?");     int min = c.readint ();      int numbers[] = new int [n];      int x;     double sum = 0;      double average = 0;       //n = number of random integers generated     (x = 1 ; x <= n-1 ; x++)      {          numbers [x] = (int) (max * math.random () + min);      }      (x = 1 ; x <= n-1 ; x++)      {         sum += numbers [x];          average = sum / n-1);       }      c.println ("the sum of numbers is: " + sum);      c.println ("the average of numbers is: " + y.format(average));       c.println ("here numbers:");      (x = 1 ; x <= n-1 ; x++)   {         c.println (numbers [x]); //print numbers in array }   } // main method } // arrayrandom class

java arrays 0 based. here leave first array element @ default value of 0. replace

for (x = 1 ; x <= n-1 ; x++)

with 

for (x = 0 ; x < n ; x++)

edit: answer question (from deleted comment) of why not produce values between min , max

max * math.random () + min

math.random generates double values between 0.0 , 1.0. example, min of 90 , max of 100 generate numbers between , 90 , 190(!). limit values between min , max need

min + math.random() * (max - min)  ^    |_________________________|                            |                 | 90       value between 0 - 10

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