Numerical question

by Tracy Moresi
(Fairfield, ca)

Numerical question is incorrect it is 5 not 2.

Editor's Note: Thanks Tracy for your contribution. However, if you may contribute your reasons, it would be more helpful to the visitors.

As far as I understand, there are two simple series of numbers.

Series 1: 16,13,10,7
Series 2: 11,8,5,

What would be the next number in the mixed series:

16 - 11 - 13 - 8 - 10 - 5 - 7 -

Let other visitors decide the answer!