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.