Program in C to find the mean of n numbers using array

\* C Program to to find the mean of n numbers using array *\

# include < stdio.h >
int   main( )
{

int   a[25], n, i  ;
float   mean = 0, sum = 0  ;
printf(" Enter the Numbers of terms: ") ;
scanf("%d ", & n) ;
printf("\n Enter the Numbers : \n") ;
for (  i = 1 ; i < = n ; i++ )
{

scanf("%d ", & a[i]) ;

}
for (  i = 1 ; i < = n ; i++ )
{
sum = sum + a[i] ;
avg = sum / n ;

}
printf("\n Mean of entered Numbers are : %f ", mean) ;
return ( 0 ) ;

}