000 AWN struct LinkedListNode { float value; LinkedlistNode * nextNode; }; class LinkedList { private: LinkedListNode *_firstNode; 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public: LinkedList(); LinkedList(); void AddItem( float item); // implement float Average() const; 21 }; 22 23 24 25 26 27 28 29 30 float Linkedlist:: Average() const { // implement this function // You will get the average of the values 1/ stored in the nodes. } Below, implement the LinkedList::Average() iterator function. You do not need to include the heading float LinkedList::Average) const or the brackets {}