Test analysis: (1) Just solve it directly according to the data in the bar chart;

(1) First, calculate the percentage of students who seldom skip breakfast according to the data in the histogram, and then multiply it by 50 to get the result;

(3) First, calculate the percentage of students who bring breakfast to the classroom according to the data in the fan-shaped statistical chart, and then multiply it by 3600 to get the result. The answer to expressing opinions is not unique, but reasonable;

(4) Draw a tree diagram, list all equally possible situations, and then solve it according to the probability formula.

(1) As shown in the figure, there are 65+18+14+3 =100 people in this sampling survey;

(2) It is estimated that few students in this class skip breakfast;

(3) Estimate the number of people brought into the classroom for breakfast in this school.

It is a bad habit to bring breakfast to the classroom, especially in winter, when it is brought to the classroom, it is already cold, which is not good for your health.

(4) I disagree with this statement.

*** 12 cases,

A smoke first. Obviously, the probability of a person who seldom eats is

B There are three cases of "seldom eating", and so is the probability.

Comments: The application of statistical charts is the focus of junior high school mathematics, which is generally not difficult and needs to be mastered skillfully.