(1) * * The number of parents of middle school students surveyed is 40÷20%=200 (people);

(2) The degree of the central angle of sector C is:

360 ×( 1-20%- 15%-60%)= 18 ;

Class C population is 400× (1-20%-15%-60%) = 20 (people).

Supplementary pictures are as follows:

(3) According to the meaning of the question:

1 1000×60%=6600 (person),

A: Of the parents of middle school students in our school 1 1000, 6,600 are against it.

(4) Set the parents of Grade 3 (1) as A 1, A2, and the parents of Grade 3 (2) as B 1, B2,

A * * * has 12 possible outcomes, among which two people come from different classes * * * has 8 kinds.

∴P(2 people from different classes) = 8 12 = 23.