The document explains how to calculate the mean and median of a list of numbers in Java, providing an example list and its calculations. It instructs the reader to create an application that accepts five integers and displays their mean and median, followed by an updated version to allow up to 20 integers. A source code implementation is included for the calculations and main method.

1. JAVA:
The mean of a list of numbers is its arithmetic average. The median of a list is its middle value
when the values are placed in order. For example, if a list contains 1, 4, 7, 8, and 10, then the
mean is 6 and the median is 7. Write an application that allows you to enter five integers and
displays the values, their mean, and their median.
Save the file as MeanMedian.java
RevisetheMeanMedianclasssothattheusercanenteranynumberofvaluesup to 20. If the list has an
even number of values, the median is the numeric average of the values in the two middle
positions.
Save the file as MeanMedian2.java
Solution
Source code:
import java.util.*;
class methods
{
public int sum (List a)
{
if (a.size() > 0)
{
int sum = 0;
for (Integer i : a)
{
sum += i;
}
return sum;
}
return 0;
}
public double mean (List a)
{
int sum = sum(a);
double mean = 0;
mean = sum / (a.size() * 1.0);

2. return mean;
}
public double median (List a)
{
int middle = a.size()/2;
if (a.size() % 2 == 1) {
return a.get(middle);
}
else {
return (a.get(middle-1) + a.get(middle)) / 2.0;
}
}
class t {
public static void main (String[]args)
{
methods m = new methods();
List c = Arrays.asList(1,4,7,8,10);
Collections.sort(c); System.out.println(m.median(c)); System.out.println(m.mean(c));
}
}