(1) According to the meaning of the question: 15÷30%=50 (people), and the number of D-level students is 50× 10%=5 (people).

There are 50 students in this survey; Among the respondents, 5 people "don't like it very much";

So the answer is: 50; 5;

(2) The number of people in Grade C is 50-( 15+20+5)= 10 (people),

The percentage of Grade B is 2050×100% = 40%; The percentage of Grade C is 1050× 100%=20%.

Complete the statistical chart, as shown in the figure:

(3) The list is as follows:

? Male male male male-(male, male) (male, male) (female, male) (female, male) (male, male) (female, male) (female, male) (female, male) (male, male)-female (male, female) (male)

Then p = 620 = 3 10.