Need help with random arrays

[rpark712]

Hello I've been trying to make a file for random arrays for my class.
The problem I've been having is getting the mean on the random arrays of numbers.
This is the code for my work.



import java.util.*;


public class TextLab06
{

public static void main(String args[])
{
System.out.println();
System.out.print("Enter the quantity of random numbers ===>> ");
int listSize = Expo.enterInt();
System.out.println();
Statistics intList = new Statistics(listSize);
intList.randomize();
intList.computeMean();
intList.computeMedian();
intList.computeMode();
intList.displayStats();
System.out.println();
}
}


class Statistics
{

private int list[];
private int size;
private double mean; // used for the 80, 100 and 110 point versions
private double median; // used for the 100 and 110 point versions
private int mode; // used for the 110 point version only

public Statistics(int s)
{
size = s;
list = new int[size];
}

public void randomize()
{
// This provided method creates the same exact list of "random" numbers for every execution.
// You will learn more about this in Chapter 14. For now just use the provided method.
Random rand = new Random(555); //random generator
for (int k = 0; k < size; k++) //conditional statement
list[k] = rand.nextInt(11) + 10; //range of 10..20
Arrays.sort(list); //puts the random array list in order

}

public void computeMean()
{
System.out.println("Compute Mean");
/* Random rand = new Random(555); //random generator
for (int k = 0; k < size; k++)

int number = (rand.nextInt(11) + 10);
//int things = number * size;
System.out.println(k *" ");
*/
//ignore the experiment above
}

public void computeMedian()
{
System.out.println("Compute Median");
}

public void computeMode()
{
System.out.println("Compute Mode");
}

public void displayStats()
{

System.out.println(Arrays.toString(list));
System.out.println();
System.out.println("Mean: " + mean);
System.out.println("Median: " + median);
System.out.println("Mode: " + mode);
System.out.println();
}

}




Can anyone give me some helpful tips to solve this thing?

[al_Marshy_1981]

1. Create an int variable say called mean, before for loop in mean method, initialise to 0
2. inside mean method for loop add each number in the array to the variable you created
3. outside for loop divide the variable you created by the number of elements in the array

[rpark712]

2. inside mean method for loop add each number in the array to the variable you created
3. outside for loop divide the variable you created by the number of elements in the array

What do you mean by adding each number in the array to the variable I created?

[Dark]

For future reference, please use [code][/code] tags around your code to preserve formatting.

To your last question, al_Marshy_1981 suggested you added each number of the array to the variable.

He is suggesting you create a new variable like double myMeanVar in which you loop through the entire array and during each loop you read the array slot of your increment counter.

for (looping through my random array(myRandomArray) for each slot it has and incrementing the counter (i) every time)
{
  myDoubleVar = myDoubleVar + myRandomArray[i];
}
Calculate the mean using the new total of myRandomArray which is stored in myDoubleVar and the length of myRandomArray;
Print results;

[rpark712]

Would this work?

	{	
		int number = 0;
		int numElements = 0;
		double sum = 0; 
		
		numElements = size;
	
		for ( int i = 0; i < size; i++ )
		sum = sum + list[i];
	
		double mean = sum / size;
		
		System.out.println(mean);
	}

[al_Marshy_1981]

What does the output tell you?

[rpark712]

Yes thank you. It worked. Thanks for the help!