"Histogram" data collection, organization and description PPT download

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"Histogram" data collection, organization and description PPT download

Part One: Learning Objectives

Be able to recognize histograms, draw histograms, and use histograms to interpret the information contained in the data.

Histogram PPT, part 2: exploring new knowledge

In order to participate in the radio gymnastics competition between all grades in the school, the seventh grade students are going to select 40 students of similar heights from 63 students to participate in the competition. For this purpose, the heights of these 63 students were collected.

(1) Calculate the difference between the maximum value and the minimum value (range)

The minimum value is 149, the maximum value is 172, 172-149=23.

Explain that the range of height changes is 23.

(2) Determine the group distance and number of groups

Divide all data into several groups, and the distance between the two endpoints of each group (the value range of the data within the group) is called the group distance.

If we take 3 cm as a group.

Divided into 8 groups, 149≤x<152, 152≤x<155,…, 170≤x<173. The number of groups is 8 and the distance between groups is 3.

There is no fixed standard for determining the group distance and number of groups. It must be determined based on experience and specific research problems. Usually the more data there is, the more groups it is divided into. When the data is less than 100, it is usually divided into 5 to 12 groups according to the amount of data.

Histogram PPT, the third part: analysis of examples

Example 1. In order to examine the distribution of ear length of a certain type of barley, 100 ears of wheat were sampled from an experimental field, and their lengths were measured as shown in the following table (unit: cm):

List the frequency distribution table of the sample and draw the frequency distribution histogram.

Solution: (1) Calculate the difference between the maximum value and the minimum value.

Difference between maximum value and minimum value:

7.4-4.0=3.4．

(2) Determine the group distance and number of groups.

Taking the group distance to be 0.3 cm, then

Can be divided into 12 groups, the number of groups is appropriate.

Histogram PPT, Part 4: Classroom Exercises

1. In the frequency distribution table, the sum of the frequencies of each group ( ).

A. Less than the sum of the data B. equal to the sum of the data

C． Greater than the sum of data D. Can not be sure

2. In order to draw a frequency distribution histogram of a set of data, we must first calculate the set of

The range of data changes. The range of data changes refers to the ( ) of the data.

A. maximum value b. minimum value

C． The difference between the maximum value and the minimum value D. Number of data

3. In order to understand the ratings of a certain TV series among viewers of various age groups, a student from a certain school

The interest group investigated the viewing status of some viewers and divided them into six groups: A, B, C, D, E, and F. The frequency distribution histogram is as shown below.

(1) The frequency of group E is ( ), and the number of viewers surveyed is ( ).

(2) If the number of spectators in a village is 1,200, it is estimated that there are ( ) spectators over 50 years old in the village.

Histogram PPT, Part 5: Class Summary

1. General steps for drawing a frequency distribution histogram:

(1) Calculate the difference between the maximum value and the minimum value;

(2) Determine the group distance and number of groups;

(3) Column frequency distribution table;

(4) Draw a frequency distribution histogram.

2. The difference between frequency distribution histogram and bar chart

Keywords: free download of PPT courseware for mathematics in the second volume of the seventh grade of the People's Education Press, download of histogram PPT, download of data collection, organization and description PPT, .PPT format;

For more information about the PPT courseware "Collection, Organization and Description of Data Histogram", please click the "Collection, Organization and Description of Data PPT Histogram PPT" tab.

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Update Time: 2024-10-05

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 2 industry PPT template

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