"Modality" PPT courseware 3

Description

"Modality" PPT courseware 3

Learning objectives, key points, and difficulties:

1. Connect with the reality of life, understand the meaning of mode in specific situations, learn to determine the mode of a set of data, and understand the statistical significance of mode.

2. Preliminarily understand the connections and differences between the average, median and mode, and be able to initially reasonably select statistics based on the specific conditions of the data.

3. Understand the application of numbers in life, and be able to use what you have learned to reasonably solve simple practical problems.

Key point: Determine the mode of a set of data

Difficulty: Understand the application of numbers in life, and be able to use what you have learned to reasonably solve simple practical problems.

Self-study test

1. Concept

The ____ with the most ____ appearing in a set of data is called the mode of this set of data.

2. Find the mode of each set of data below

(1) 2, 5, 2, 4, 2, 2, 10, 14, 6, 7, 2, 8, 12, 9, 3,

(2) 70, 66, 70, 80, 70, 50, 70, 70, 30, 70, 50, 32, 13, 60, 50, 70

(3) 3.5, 4.2, 2.1, 3.5, 4.7, 4.2, 3.5, 4.0, 4.2, 3.1

(4) 61, 52, 47, 100, 96, 18, 24, 33, 9, 85

Teacher prompts

1. In order to find out the shoe sizes worn by junior high school boys, a shoe store randomly selected 60 boys from the school students and conducted a survey on the shoe sizes they wore. The statistics are as follows:

The shoe sizes worn by these 60 students are a set of data. What are the median and mode of this set of data?

Can you provide stocking suggestions for this shoe store based on the data above?

Analysis: Generally speaking, shoe stores are more concerned about which size of shoes sells the most, that is, they are concerned about the mode of a set of data composed of the sizes of the shoes sold. The sizes of 60 pairs of men's shoes form a sample data. By analyzing the sample The data can find the mode of the sample data, and then estimate which size of shoes the shoe store sells the most.

2. The daily minimum temperature records of a certain city in early January 2013 are as shown in the following table:

In this set of data, how many times does each data appear? Which data appears most frequently? What are the data that are the mode?

Compliance assessment

1. Multiple choice questions

(1) According to the statistics of electricity consumption at the end of the month in residential area A, 3 households use 45 kilowatt hours of electricity, 5 households use 50 kilowatt hours of electricity, and 6 households use 42 kilowatt hours of electricity. The average electricity consumption is ( ) kilowatt hour.

A 41 B 42 C 45.5 D 46

(2) The physical examination scores of 10 junior high school graduates are as follows: 25, 26, 26, 27, 26, 30, 29, 26, 28, 29. The median of this score is ( )

A 30 B 26.5 C 26 D 25

(3). The mode of the group of sports results in the above question is ( )

A 25 B 26 C 27 D 29

2. Fill in the blanks

In a test in a certain school, the statistics of mathematics scores of students in classes A and B are as follows:

Please answer the following questions based on the information provided in the form:

(1) The mode of Class A is _____ points, and the mode of Class B is _____ points. Judging from the mode, the class with better scores is _____.

(2) The median of Class A is _____ points, the median of Class B is _____ points, and the percentage of students in Class A whose scores are above the median (including the median) is _ ____%, the percentage of students in Class B whose scores are above the median (including the median) is _____%. The class with better scores from the median is _____ class.

(3) If the score is above 85 points, it is considered excellent, then the excellence rate of Class A is _____%, and the excellence rate of Class B is _____%. From the perspective of excellence rate, Class _____ has a better score.

Keywords: Mode teaching courseware, Qingdao edition eighth grade mathematics volume PPT courseware download, eighth grade mathematics slide courseware download, mode PPT courseware download, .PPT format;

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"Median and Mode" PPT:

"Median and Mode" PPT Part One Content: Teaching Objectives 1. Understand and be able to find the median and mode of a set of data in actual situations. 2. According to specific problems, be able to select appropriate statistical tables to represent different characteristics of the data. 3. Feel statistics in life..

"Median and Mode" PPT Courseware 2:

"Median and Mode" PPT Courseware 2 The average, median and mode can all be used as representatives of a set of data. They each have their own characteristics and can provide information from different angles. The average is obtained through calculation, using the information of all the data, and is a practical question...

"Median and Mode" PPT courseware:

"Median and Mode" PPT courseware 1. Arrange n pieces of data in order from small to large (or from large to small). If n is an odd number, then the number at the _______ position is called the median of this set of data; if n is an even number, then the number in the middle position is the median of the set of data. _____ of data..

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Update Time: 2024-08-09

This template belongs to Mathematics courseware Qingdao Edition Eighth Grade Mathematics Volume 1 industry PPT template

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