Given the Persons table:
+-----+--------------+-------+
| Id   |  FirstName  | Age   |
+------+-------------+-------+
|   1  | Kate        |  100  |
|   2  | Misha       |    0  |
|   3  | Nick        | NULL  |
|   4  | Larisa      |  200  |
+------+-------------+-------+
What is the result of the following query execution?
SELECT AVG (Age) FROM Persons
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