In order to make the production plan of school uniforms for the seventh, eighth and ninth grade students in this city, the relevant departments are going to conduct a height survey of junior high scho

In order to make the production plan of school uniforms for the seventh, eighth and ninth grade students in this city, the relevant departments are going to conduct a height survey of junior high school boys in 180. At present, there are three investigation methods. (1)C, the sample selected by scheme c is extensive and representative; (2)① 15, 33, 96, 33, 3, ② as shown below.

Analysis of test questions: (1) According to the meaning of the questions, analyze the three schemes one by one, and only C meets the requirements of sampling survey, with representative data and wide coverage;

(2) According to the solution of frequency, the results can be obtained by adding the data of each row.

(1) According to the meaning of the question: (a) The height of male basketball and volleyball players in Junior Sports School 180 was measured, and the data was inaccurate;

(b) The statistical data of 65,438+080 boys' height obtained from other places should be based on the actual measured data;

(3) Conforming to the principles and requirements of random sampling survey.

You should choose c;

(2) According to the method of finding frequency, the frequency can be obtained by adding the data of each line, and the drawing can be drawn accordingly:

Comments: The application of statistical chart is the focus of junior high school mathematics, which runs through the whole junior high school mathematics study. It is a common knowledge point in the senior high school entrance examination, which is generally not difficult and needs to be mastered skillfully.