i want to create a field for average rate with other fields
All fields are in one field group
For Example

1. field1 = 70
2. field2 = 60
3. field3 = 80
4. field4 = 0
5. field5 = 0
6. field6_total = 70

im tried with this code but It didn’t work for me

function my_acf_save_post( $post_id ) {

$score = get_field('score');
$total_score = $score['field6_total'];
$v1f = $score['field1']; 
$v2f = $score['field2']; 
$v3f = $score['field3']; 
$v4f = $score['field4'];
$v5f = $score['field5'];
$array_total_average = array($v1f,$v2f,$v3f,$v4f,$v5f);
$array_total_average = array_filter($array_total_average);
$total_score_average =array_sum($array_total_average) / count($array_total_average);

update_field($total_score, $total_score_average, $post_id);

}

add_action('acf/save_post', 'my_acf_save_post', 20);

Is there a function that exists for this, or one that I can modify to make this work?
i used a advanced custom field plugin