Intro to Java help please!

[beginner233]

Hi I would really appreciate if someone could tell me what I am doing wrong. I think I have a major error but I can't seem to find out where it is =( My assignment is due tomorrow so if anyone would be up right now and could tell me what is wrong I would appreciate it.

import java.util.Scanner;
public class EmployeeTime
{
	public static void main(String[] args)
	{

		Scanner input = new Scanner (System.in);
		int sumHours, sumMinutes, startHour, startMinute, endHour, endMinute;
		double averageHours, averageMinutes;
		String [] lastNames = new String [10];
		int [] hours = new int [lastNames.length];
		int [] minutes = new int [lastNames.length];
		for (int i=0; i<lastNames.length; i++)
		{
			readEmployeeData (lastNames,startHour, startMinute, endHour, endMinute);
			determineTimeWorked (hours, minutes, startHour, startMinute, endHour, endMinute);
			sumHours = calculateSumHours(hours, sumHours);
			sumMinutes = calculateSumMinutes (minutes, sumMinutes);
			if (sumMinutes >= 60)
			{
				sumHours = adjustHours(sumHours);
				sumMinutes = adjustMinutes (sumMinutes);
			}
		}
		averageHours = calculateAverageHours (sumHours);
		averageMinutes = calculateAverageMinutes (sumMinutes);
		writeEmployeeInformation (lastNames, hours, minutes);
		writeAverageTimes (averageHours, averageMinutes);
	}

	public static void readEmployeeData (String [] lastNames, int startHour, int startMinute, int endHour, int endMinute)
	{
		System.out.print("Please enter the last name of the employee.");

		lastNames [i] = input.next();

		System.out.print("Please enter the hour the employee started work. The hour must be represented in military time."
						+ "For example, 11:00 AM would be 11. 11:00 PM would be 23.");

		startHour = input.nextInt();

		System.out.print ("Please enter the minute of the hour the employee started work. For example, if the employee "
							+ "started at 23:14, then the minute entered would be 14.");

		startMinute = input.nextInt();

		System.out.print ("Please enter the hour that the employee clocked out. The hour must be in military time again.");

		endHour = input.nextInt();

		System.out.print ("Please enter the minute of the hour the employee clocked out.");

		endMinute = input.nextInt();
	}

	public static void determineTimeWorked (int [] hours, int [] minutes, int startHour, int startMinute, int endHour, int endMinute)
	{
		int hoursWorked;

		int minutesWorked;

		hoursWorked = endHour - startHour;
		minutesWorked = endMinute - startMinute;

		if (minutesWorked < 0)
		{
			minutesWorked = minutesWorked + 60;
			hoursWorked = hoursWorked - 1;
		}
		hours [i] = hoursWorked;
		minutes [i] = minutesWorked;
	}

	public static int calculateSumHours (int [] hours, int sumHours)
	{
		sumHours = sumHours - hours [i];
		return sumHours;
	}

	public static int calculateSumMinutes (int [] minutes, int sumMinutes)
	{
		sumMinutes = sumMinutes + minutes [i];
		return sumMinutes;
	}
	public static int adjustHours (int sumHours)
	{
		sumHours = sumHours + 1;
		return sumHours;
	}
	public static int adjustMinutes (int sumMinutes)
	{
		sumMinutes = sumMinutes - 60;
		return sumMinutes;
	}
	public static double calculateAverageHours (int sumHours)
	{
		double averageHours = (double) sumHours/10;
		return averageHours;
	}
	public static double calculateAverageMinutes (int sumMinutes);
	{
		double averageMinutes;
		averageMinutes = (double) sumMinutes/ (double)10;
		return averageMinutes;
	}
	public static void writeEmployeeInformation (String [] lastNames, int [] hours, int [] minutes)
	{
		System.out.printf("%23s%33s%18s", "Last Name", "Hours Worked", "Minutes Worked");
		for (int i = 0; i < 10; i++)
		System.out.printf("%23s%33s%18s", lastNames [i], hours [i], minutes [i]);
	}
	public static void writeAverageTimes (double averageHours, double averageMinutes)
	{
		System.out.print ("The average number of hours is " + averageHours + ". The average number of minutes worked is" + averageMinutes + ".");
	}
}

these are the errors I am getting.

F:\EmployeeTime.java:35: cannot find symbol
symbol : variable i
location: class EmployeeTime
lastNames = input.next();
^
F:\EmployeeTime.java:35: cannot find symbol
symbol : variable input
location: class EmployeeTime
lastNames = input.next();
^
F:\EmployeeTime.java:40: cannot find symbol
symbol : variable input
location: class EmployeeTime
startHour = input.nextInt();
^
F:\EmployeeTime.java:45: cannot find symbol
symbol : variable input
location: class EmployeeTime
startMinute = input.nextInt();
^
F:\EmployeeTime.java:49: cannot find symbol
symbol : variable input
location: class EmployeeTime
endHour = input.nextInt();
^
F:\EmployeeTime.java:53: cannot find symbol
symbol : variable input
location: class EmployeeTime
endMinute = input.nextInt();
^
F:\EmployeeTime.java:70: cannot find symbol
symbol : variable i
location: class EmployeeTime
hours = hoursWorked;
^
F:\EmployeeTime.java:71: cannot find symbol
symbol : variable i
location: class EmployeeTime
minutes = minutesWorked;
^
F:\EmployeeTime.java:76: cannot find symbol
symbol : variable i
location: class EmployeeTime
sumHours = sumHours - hours ;
^
F:\EmployeeTime.java:82: cannot find symbol
symbol : variable i
location: class EmployeeTime
sumMinutes = sumMinutes + minutes ;
^
F:\EmployeeTime.java:100: missing method body, or declare abstract
public static double calculateAverageMinutes (int sumMinutes);
^
F:\EmployeeTime.java:103: cannot find symbol
symbol : variable sumMinutes
location: class EmployeeTime
averageMinutes = (double) sumMinutes/ (double)10;
^
F:\EmployeeTime.java:104: return outside method
return averageMinutes;
^
13 errors

Tool completed with exit code 1

Please any help would be appreciated!

[BestJewSinceJC]

You're attempting to use the variable 'i' but you never declared that variable. And you also didn't follow any of this site's rules.