"Medium and Number" PPT courseware 2

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"Medium and Number" PPT courseware 2

The mean, 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 perspectives. The average number is obtained through calculation. The use of all data information is the most extensive concentrated trend measure value in the actual problem, but it is easily affected by data; medium numbers are representative values ​​in a set of data positions, which are not vulnerable to extreme extremes. Value impact; the number of people is the peak of a set of data, and it is also a position representing value. Its disadvantage is that it is not unique, and sometimes there may be two or more people that exist in a set of data. When dealing with actual problems, it is necessary to comprehensively consider the specific situation of the problem, the characteristics of the data and the characteristics of the statistics to make a choice.

1. (5 points) (2013·Jinzhou) In response to the call to "save water", Xiaogang randomly investigated the annual water consumption (unit: tons) of the families of 5 of the 35 students in the class. The records are as follows: 8, 9, 8, 7, 10, the average and median of this set of data are ()

A． 8, 8

B． 8.4,8

C. 8.4, 8.4

D. 8,8.4

2. (5 points) (2013·Xiangyang) After the seventh grade students completed the project study "Talk about water conservation from data", they actively practiced "Saving water, starting from me". The following table shows 10 students selected from 400 seventh grade students. Students counted the water savings of their families in one month:

Then the mode and mean of this set of data are ()

A． 0.4 and 0.34 B. 0.4 and 0.3

C. 0.25 and 0.34 D. 0.25 and 0.3

3. (5 points) A student participated in shooting training and shot six bullets in total. The number of hits were 3, 4, 5, 7, 7, and 10. Which of the following statements is incorrect ()

A． Its average is 6 B. Its mode is 7

C. The median is 7 D. The median is 6

4. (5 points) The average of a set of data 3, x, 4, 5, and 8 is 5, then the mode and median of this set of data are ()

A． 5,6 B. 4,4.5

C. 5,5 D． 5,4.5

12. (24 points) In the knowledge competition organized by the school on "Knowing Honor and Disgrace, Traveling in a Civilized Way", the number of participants in each class was the same, and the scores were divided into four levels: A, B, C, and D. The scores for the corresponding levels were in order. Recorded as 100 points, 90 points, 80 points, and 70 points, the school organizes the scores of Class 1 and Class 2 of a certain grade and draws them into the following statistical chart:

Please answer the following questions based on the information provided above:

(1) In this competition, the number of people in Class 2 with grades above C level (including C level) is ________;

(2) Please complete the form:

(3) Please analyze the results of this competition from the following different perspectives:

① Compare the scores of Class 1 and Class 2 from the perspective of average and median;

② Compare the results of Class 1 and Class 2 from the perspective of average and mode;

③Compare the results of Class 1 and Class 2 from the perspective of the number of people with Grade B or above (including Grade B).

① From the perspective of the average, the scores of the two classes are the same. From the perspective of the median, the scores of class one are better than those of class two, so the scores of class one are better;

② From the perspective of the average, the scores of the two classes are the same. From the perspective of the mode, the scores of the second class are better than those of the first class, so the scores of the second class are better;

③From the perspective of the number of people in Class B and above (including Class B), the number of people in Class 1 is 18, and the number of Class 2 is 12, so the results in Class 1 are good

Keywords: Median and mode teaching courseware, Hebei Education Edition ninth-grade mathematics PPT courseware download, ninth-grade mathematics slide courseware download, median and 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:

"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..

"Median and Mode" data analysis PPT courseware:

"Median and Mode" Data Analysis PPT Courseware Learning Objectives 1. Be able to find the median and mode of a set of data 2. Master the functions of median and mode 3. Be able to use median and mode Analyzing Practical Problems What is the median? 1. Median: Sort a set of data according to...

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Update Time: 2024-10-05

This template belongs to Mathematics courseware Hebei Education Edition Ninth Grade Mathematics Volume 1 industry PPT template

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