The way to get this survey is sampling survey.

(2) The frequency of segments 84-95 = 200-5-10-15-28-60-28+.

The completed chart is as follows:

(3) =7 1%;

(28+14) ÷ 200×12000 = 2520 people,

Therefore, it can be estimated that the passing rate of students' math scores in this city is 7 1%, and the number of outstanding students is 2520.