(1) According to the meaning of the question, the number of people who like "snails" is: 50-(14+21+5) =10 (people).

Complete the statistical chart, as shown in the figure:

(2) According to the meaning of the question: 2000×1450×100% = 560 (person),

It is estimated that there are 560 students who like stinky tofu best in the school;

(3) The list is as follows:

? ABCDA(A，A)(B，A)(C，A)(D，A)B(A，B)(B，B)(C，B)(D，B)(C(A，C)(B，C)(C，C)(D，C)。

Then p = 1 16.