3 Mean, Median & Mode Continuous Series

#include <stdio.h>

const int MAX_SIZE = 25;

void Mean(int ci[][2], int fre[], int n){
    int mid[n];
    for(int i=0 ; i<n ; i++){
        mid[i] = (ci[i][0]+ci[i][1])/2;
    }

    long long int sum =0 , N=0;
    for(int i=0 ; i<n ; i++){
        sum += (fre[i]*mid[i]);
        N += fre[i];
    }

    float mean = (float)sum / (float)N ;

    printf("\nMean for the given data is %.3f ",mean);
}

void Median(int ci[MAX_SIZE][2], int fre[MAX_SIZE], int n ){
    int cf[n];
    int size = ci[0][1] - ci[0][0];
    long int N =0;
    for(int i=0 ; i<n ; i++){
        N+=fre[i];
        cf[i] = N;
    }
    float Nby2 = (float)N/2;
    float L,F,CF;
    for(int i=0 ; i<n ; i++){
        if(Nby2<cf[i]){
            L = ci[i][0];
            F = fre[i];
            CF = cf[i-1];
            break;
        }
    }

    float K = (Nby2 - CF)/ F;
    float median = L + (K*size);

    printf("\nMedian for this problem is %.3f",median);

}
void Mode(int ci[MAX_SIZE][2], int fre[MAX_SIZE], int n){
    float f1=fre[0];
    int index =0;
    for(int i=1 ; i<n ; i++){
        if(f1<fre[i]){
            f1 = fre[i];
            index = i;
        }
    }

    float f0 = fre[index-1] , f2= fre[index+1];

    float k = (f1-f0)/( (2*f1) - f2 - f0);
    float size = ci[0][1] - ci[0][0];
    float mode = ci[index][0] + (k*size);


    printf("\nMode of given data is %.3f \n",mode);

}
int main()
{
    int n;
    int ci[MAX_SIZE][2],fre[MAX_SIZE];
    printf("Enter the number of elements \n");
    scanf("%d",&n);


    printf("\nEnter CI one by one \n");
    for(int i=0 ; i<n ; i++){
        for(int j=0 ; j<2 ; j++){
            scanf("%d",&ci[i][j]);
        }
    }

    printf("\nNow enter the %d frequencies : \n",n);
    for(int i=0 ; i<n ; i++){
        scanf("%d",&fre[i]);
    }

    // now calling function which will print the mean
    Mean(ci, fre, n);

    // now callign function which will print the median of the given data
    Median(ci, fre, n);

    // now calling function which will print the mode of given data
    Mode(ci, fre, n);

    return 0;
}