Program C untuk menentukan mean, modus dan median

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

int main () {
    int n,a,b,temp=0,q1,q2;
    float median;
    printf("\t\t\tPROGRAM STATISTIKA\n\n");
    //input jumlah data
    printf("masukkan jumlah data: "); scanf("%d",&n);fflush(stdin);
    //input data
    int data[n],frekuensi[n],modus,max=-1000,sum=0;
    float mean;
   
    for(a=0;a<n;a++){
                     printf("masukkan data ke-%d <0..9>: ",a+1);scanf("%d",&data[a]);
                     sum=sum+data[a];
                     }
                    
    printf("\n\n");
   
     //median
    for(a=0;a<(n-1);a++){
                         for(b=a;b<n;b++){
                         if(data[b]<data[a]){
                                               temp=data[a];
                                               data[a]=data[b];
                                               data[b]=temp; };                   
                                               };
                                               }
    printf("\ndata setelah diurutkan: ");
    for(a=0;a<n;a++){
                     printf("%d,",data[a]);}
    if(n%2==1){q2=(n/2);
                        median=data[q2];
                        printf("median adalah: %.2f",median);}
    else if(n%2==0){q1=(n/2)-1; q2=(n/2);
                    median=((float)data[q1]+(float)data[q2])/2;
                    printf("\nmedian adalah: %.2f",median);}
   
    printf("\n");
   
    
    //mencari rata-rata
    mean=(float)sum/n;
    printf("mean adalah: %.2f\n",mean);
    //mencari modus
    for(a=0;a<10;a++){frekuensi[a]=0;
                      for(b=0;b<n;b++){
                                       if(data[b]==a){frekuensi[a]=frekuensi[a]+1;};
                                       }
                      if(frekuensi[a]>max) {max=frekuensi[a];modus=a;}
                      };
   
    printf("modus adalah: %d\n\n",modus);
    //histogram
    printf("\t\tHISTOGRAM\n");
    for(a=0;a<10;a++){
                      if(frekuensi[a]!=0){
                                          printf("%d- ",a);
                                          for(b=0;b<frekuensi[a];b++) printf("*");
                                          printf("\n");
                                          };
                                          };
  
    system("pause");
    return 0;
}