Go Passing arrays to functions

package main

import "fmt"

func main() {
   /* an int array with 5 elements */
   var  balance = []int {1000, 2, 3, 17, 50}
   var avg float32

   /* pass array as an argument */
   avg = getAverage( balance, 5 ) ;

   /* output the returned value */
   fmt.Printf( "Average value is: %f ", avg );
}
func getAverage(arr []int, size int) float32 {
   var i,sum int
   var avg float32  

   for i = 0; i < size;i++ {
      sum += arr[i]
   }

   avg = float32(sum / size)
   return avg;
}