"Representation of Data" Collection and Organization of Data PPT Download (Lesson 2)

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"Representation of Data" Collection and Organization of Data PPT Download (Lesson 2)

Part One Content: Basic Knowledge Key Points

Knowledge Point 1 Bar Chart

1. In order to understand the main channels through which middle school students obtain information, 50 middle school students were randomly selected for a questionnaire survey. The questionnaire set up five options: "A: Newspaper, B: TV, C: Internet, D: People around you, E: Others". (You must choose one of the five items and you can only choose one). Based on the survey results, a bar chart as shown in the figure is drawn. The survey method and the value of a in the chart are (D)

A.Comprehensive investigation;26 B.Comprehensive investigation;24

C. Sampling survey; 26 D. Sampling survey; 24

2. The picture shows the statistical results of innovative education practice survey reports submitted by four groups in the seventh grade class (2) of a middle school. Among the four groups, the largest number of submissions was 10, accounting for 40% of the total number of the class.

Knowledge point 2: Number of groups and distance between groups

3. In order to draw a frequency histogram of a set of data, we must first calculate the variation range of this set of data. The variation range of the data refers to the data (C)

A. Maximum value

B. Minimum value

C. The difference between the maximum value and the minimum value

D.Number

4. There are 100 data, the maximum value is 76, and the minimum value is 32. If the group distance is 5 and the data is grouped, it should be divided into 9 groups.

Knowledge point 3 Frequency and frequency histogram

5. In a sample, 40 data fall into 5 groups respectively. The frequencies of groups 1, 2, 3, and 5 are 2, 8, 15, and 5 respectively. Then the frequency of group 4 is (B)

A.5 B.10 C.15 D.20

6. In the frequency histogram, the height of each rectangle is equal to (D)

A.Number of groups

B. Group distance

C.Sample data

D. The corresponding frequency of each group

Data representation PPT, part 2: improvement of comprehensive capabilities

8. As shown in the figure, a certain class organized the safety knowledge competition results and drew them into a frequency histogram. The percentages of the first four groups from left to right in the figure are 4%, 12%, 40%, and 28% respectively. The frequency of the fifth group is 8, then the following statement:

① There are 50 students participating in this class;

②The percentage of the fifth group is 16%;

③The largest number of people have scores between 70 and 80 points;

④There are 14 students with scores of 80 or above.

9. In order to understand the physical development of its students, a middle school measured the height of 40 girls of the same age. The results are as follows: (the data are all integers, unit: cm)

168,160,157,161,158,153,158,164,158,163,158,157,167,154,159,1 66,159,156,162,158,159,160,164,164,170,163,162,154,151,146,151 ,160,165,158,149,157,162,159,165,157.

After sorting the above data, please list the frequency distribution table, draw the frequency histogram, and use the drawn histogram to explain which height range most students are in? Omitted.

10. (Original) In order to inherit the excellent traditional culture of the Chinese nation, a middle school in our county organized a "Knowledge Competition on the Excellent Traditional Culture of the Chinese Nation". After the competition, the scores of the participating students were sorted and divided into A and B. , C and D four levels, and the following statistical tables and charts have been produced, but they are not complete. Please answer the following questions based on the statistical charts and tables:

(1) In the table, m= 120; n= 0.2.

(2) Complete the frequency histogram.

(3) Calculate the degree of the central angle β in the sector chart.

Data representation PPT, the third part: Expansion, exploration and breakthrough

11. In a social survey activity, Xiao Li collected the number of steps taken by 20 members of a "walking sports" team in a day. The records are as follows:

(1) Group these 20 data into groups with a group interval of 1000, sort them statistically, and draw a frequency histogram;

(2) If there are 200 people in the team, please estimate the number of people who walk less than 8,500 steps a day.

Solution: (1) ① Determine the maximum and minimum values ​​of the given data: the minimum value in the above data is 5640, and the maximum value is 9865;

②Group the data appropriately: the difference between the maximum value and the minimum value is 9865-5640=4225, and the group interval is 1000, 4225÷1000=4.225. You can consider dividing it into 5 groups;

③ Count the number of times data appears in each group:

Keywords: Free download of Beijing Normal University Edition seventh-grade mathematics PPT courseware, first volume, data representation PPT download, data collection and organization PPT download, .PPT format;

For more information about the PPT courseware "Data Collection and Organizing Data Representation", please click the Data Collection and Organizing PPT Data Representation PPT tab.

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Update Time: 2024-10-07

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