"Modities" PPT courseware

Description

"Modities" PPT courseware

Use your brain

The following is a shoe store's sales statistics of men's shoes of various sizes over a period of time:

Consider the following questions:

1. How many pairs of men's shoes were sold during this period?

2. Which size of shoes sells the most?

3. What information can this statistical table give the shoe store owner?

4. Among these problems, what is the shop owner most concerned about?

Among these problems, the question that store owners are most concerned about is: which size of shoes is the best to sell, and which size of shoes is not easy to sell.

In this set of data, 25 appears the most, and it is also the data that the store owner is most concerned about. We call this data the mode of this set of data.

In a set of data, the data that appears most frequently is called the mode of the set of data.

When a certain data appears repeatedly in a set of data, the mode can often be used as a representative value of the value of this set of data.

Try it: What is the mode of the set of data 8,14,9,8,9,15,30,8?

Solution: 8 appears the most (3 times) in this set of data. Therefore, the mode of this set of data is 8.

The number of parts processed by workers in a certain workshop per day is as follows:

What is the mode of this set of data?

Solution: 6 and 7 appear the most in this set of data, both 6 times. Therefore, the mode of this set of data is 6 and 7.

Think about it: a. What conclusion did you get from this question?

A set of data has more than one mode.

b. What are the advantages and disadvantages of mode?

Advantages: For a set of data, the mode is easily obtained from statistical tables.

Disadvantages: The mode cannot make full use of all the data in this set of data, so the mode is not often used.

practise:

1. There are two groups of tourists A and B playing group games in the park. The ages of the two groups of tourists are as follows (unit: years)

Group A:13 13 14 15 15 15 15 16 17 17

Group B:3 4 4 5 5 6 6 6 54 57

Answer the following questions:

(1) The average age of Group A tourists is _____, and the mode is _____. Among them, the one that can better reflect the age characteristics of Group A tourists is _______;

(2) The average age of Group A tourists is _____, the median is _____, and the mode is _____. Among them, the one that can better reflect the age characteristics of Group A tourists is _______;

2. The following is a list of the minimum living security standards for residents in 10 cities in China (unit: yuan/person, month):

Among the feature numbers of average, mode and median, the number of features that can reflect the minimum living standard of residents in these 10 cities is _____.

summary:

The three representative numbers, mode and mean, describe the general level or central tendency of a set of data values ​​from different perspectives. People often choose different representative numbers from different perspectives. Among them, the average is the most widely used.

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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: 2024-07-30

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

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