Problems with arithmetic operations

I do mathematical operations on my tables to retrieve the average records.
I have a table of insurance useda table of connected clients, and client.
Now, I would like to extract the average number of incidents per year took place from the first strategy until today.

If I run this query:

SELECT (SUM (c.incFatti () + c.incSubiti ())) AS AVERAGE / * incFatti() is made by the customer, incSubiti() incidents suffered incidents * /.
CLIENT c;

I get 8, for example, I have a total of 8 incidents in my DB.
Now, if I run it:

SELECT ROUND (((SYSDATE - MIN (p.data_stipulazione)) / 365), 2)
Polizza p;

I receive 1.28, for example, a year and a few months since the creation of the first strategy until today.

OK, 8 / 1.28 = 6.25 accidents per year and that's what I would get with a single query.
The latter is:

SELECT (ROUND)
Sum (c.incFatti () + c.incSubiti ()) / / * the first query * /.
(((SYSDATE - MIN (p.data_stipulazione)) / 365), 2) AS AVERAGE / * the second query * /.
CLIENT c, polizza p

But I get 31.26! When I make a mistake?

Try

select round (n1 / average, 2)
  from (select sum (c.incfatti () + c.incsubiti ()) n1 /* from the first query */
                                                      from cliente) c,
       ( (select ( (sysdate - min (p.data_stipulazione)) / 365) as average /* from the second query */
                                                                          from polizza))

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