Average of Averages

Consider the following diagram:

Each number in the diagram, connected to 4 other numbers, must be equal to their average:
What is the number in the circle marked with a question mark?
Note: The average of four numbers is their sum divided by 4.

Difficulty level (1 very easy - 10 very hard): 1

Topics:
Algebra -> Equations Algebra -> Inequalities -> Averages / Means
Sources:
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