Wht is defect density and hw you find,Hw can you expect the defects

6.Wht is defect density and hw you find?
a. no of defects found by no .of expected defects. i said
Defect density in no. pre delivered defects/ size of application.
Usually it will be covered at the end of iteration or the project .
In my current project .Project management use to do at end of each
iteration.

7.Hw can you expect the defects?
a. generall expected defects in the test plan.
Apart from following different specification techniques like boundary value
analysis , equivalence partitioning ,State transition...the most common
technique i am using is error guessing.
Since i have over 10 years of experience in quality side..detecting
errors..my experience comes to handy in either scripting test cases for good
coverage or defect finding during test execution.