Mean, median, mode calculator

#include <stdio.h>
#include<math.h>
#include<stdlib.h>
#include<time.h>
#define SIZE 99
void sort(int data[]);
int mean(int data[]), mode(int data[]), median(int data[]);
void main()
{
	int arr[SIZE], i, flag1, flag2, flag3;
	void sort(arr);
	srand(time(NULL));
	for (i = 0; i < SIZE; i++)
	{
		arr[i] = 1 + rand() % 100;
	}
	printf("The generated array is:\n");
	for (i = 0; i < SIZE; i++)
		printf("%d\t\t", arr[i]);
	printf("\n");
	sort(arr);
	printf("\nThe sorted array is:\n");
	for (i = 0; i < SIZE; i++)
		printf("%d\t\t", arr[i]);
	flag1 = mean(arr);
	flag2 = mode(arr);
	flag3 = median(arr);
	printf("\n\nThe mean of the values is: %d\nThe median of the values is: %d\nThe mode of the values is: %d", flag1, flag3, flag2);
}
void sort(int data[])
{
	int i, j, temp, count;
	for (i = 0; i < SIZE - 1; i++)
	{
		count = 0;
		for (j = 0; j < SIZE - (1 + i); j++)
		{
			if (data[j] > data[j + 1])
			{
				temp = data[j];
				data[j] = data[j + 1];
				data[j + 1] = temp;
				if (temp != data[j])
					count++;
			}
		}
		if (count == 0)
			break;
	}
}

int mean(int data[])
{
	int i, sum=0, average;
	for (i = 0; i < SIZE; i++)
		sum = sum + data[i];
	average = sum / SIZE;
	return average;
}

int mode(int data[])
{
	int i, j, count, t_count = 0, value;
	for (i = 0; i < SIZE; i++)
	{
		count = 0;	
		for (j = i+1; j < SIZE; j++)
		{
			if (data[i] == data[j])
				count++;
		}
		if (t_count < count)
		{
			t_count = count;
			value = data[i];
		}		
	}
	if (t_count != 0)
		return value;
}

int median(int data[]) 
{
	int middle, i;
	if (SIZE % 2 != 0)
	{
		i = ceil(SIZE / 2);
		middle = data[i];
		return middle;
	}
	else
	{
		i = SIZE / 2;
		middle = ((data[i] + data[i-1]) / 2);
		return middle;
	}
}