Is this a correct approach to weighting algorithm in a math equation?

Question

I have a list of products and each product is connected to another. Each connection strength_level ranges from 1 to 10.

Product A to B strength_level=7
Product A to c strength_level=8
Product B to A strength_level=2
Product B to C strength_level=2
Product C to A strength_level=4
Product C to B strength_level=3

I want to convert this code to an equation. My code:

Foreach(products as product){
   // strength variables
   $outwardTotal = 0;
   $inwardTotal= 0;

   // Get in and out connections
      $connectionToOthers = [sqlArray]
      $connectionToMe = [sqlArray]

   // Loop through all connections from this to other
   Foreach($connectionToOthers as $outward){
        $outwardTotal = $outwardTotal+ $outward['strength_level'] + 4;
   }
   // Loop through all connections fromt other product to this 
   Foreach($connectionToMe as $inwards){
        $inwardTotal= $inwardTotal+ $inwards['strength_level'] + 1;
   }
    $outwardAvg = $outwardTotal/COUNT($connectionToOthers);
    $inwardAvg= $inwardTotal/COUNT($connectionToMe);
}

   $final_strength = ($outwardAvg + $inwardAvg)/(COUNT($connectionToOthers) + COUNT($connectionToMe));

I have attempted the following:https://i.stack.imgur.com/kGNRw.png where c is number of products, n outward connections and m is for inward connections and S is the strength of the connection.