"Median and Mode" Data Analysis PPT Courseware 2

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"Median and Mode" Data Analysis PPT Courseware 2

diagnostic exercise

1. A biological interest group of 11 people went outside the school to collect plant specimens. Among them, 2 people collected 6 specimens each, 4 people collected 3 specimens each, and 5 people each collected 4 specimens. Then the average number of specimens collected by each person in this interest group is ( )

A. 3 pieces B. 4 pieces C. 5 pieces D. 6 pieces

In a certain math test, Xiaoying scored 78 points. There are 32 people in the class. The scores of other students are 1 100 points, 4 90 points, 22 80 points, 2 62 points, 1 30 points, and 1 25 points.

Xiaoying calculated that the average score of the whole class was 77.4 points, so Xiaoying told her mother that her math score this time was at the "above average level" in the class. Is what Xiaoying told her mother true? What do you think about this?

Definition of median:

Generally, n data are arranged in order of size, and the data in the middle (or the average of the two middle data) is called the median of this set of data.

What the data represents:

The mean, median, and mode are all representatives of data, and they describe the "average level" of a set of data.

What are the characteristics of the median?

Using the median as a representative of a set of data has poor reliability. It cannot fully utilize the information of all data, but it is not affected by extreme values. When individual data in a set of data change significantly, it can be used to Describe the "central tendency" of this set of data.

What are the characteristics of mode?

Using the mode as a representative of a set of data has poor reliability. Its size is only related to part of the data in the set of data, but it is not affected by extreme values. When certain data appear repeatedly in a set of data, the mode is often a statistic that people are particularly concerned about.

Class summary

1. Definition of median: Generally, n data are arranged in order of size, and the data in the middle (or the average of the two middle data) is called the median of this set of data.

2. Definition of mode: The data that appears most frequently in a set of data is called the mode of this set of data.

3. The meaning of data representation: The average, median, and mode are all representatives of data. They describe the "average level" of a set of data.

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For more information about the "Data Analysis Median and Mode" PPT courseware, please click the Data Analysis ppt Median and Mode ppt tag.

"Median and Mode" Data Analysis PPT Courseware 3:

"Median and Mode" Data Analysis PPT Courseware 2 Review Introduction What is the median? 1. Median: Arrange a set of data in order from small to large (or large to small), then the number in the middle is the median of this set of data; if the data...

"Median and Mode" data analysis PPT courseware:

"Median and Mode" Data Analysis PPT Courseware Average: used to reflect the central tendency of a set of data and reflect the average level of a set of data. The sign on the riverside says that the average depth is 1.1m. Can a pony with a height of only 1.4m wade across the river without being in danger?

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Beijing Normal University eighth grade first volume mathematics industry PPT template

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