| Category | Format | Size |
|---|---|---|
| Beijing Normal University eighth grade first volume mathematics | pptx | 6 MB |
"Median and Mode" Data Analysis PPT Courseware
Description
"Median and Mode" Data Analysis PPT Courseware
Average: used to reflect the central tendency of a set of data and the average level of a set of data.
The sign on the riverside reads "The average depth is 1.1m". Can a pony with a height of only 1.4m wade across the river without danger?
Median concept
We call this number the median of this set of data.
So what are the characteristics of the median?
If the number of data in a set is an even number, which number is the median? Please discuss and answer.
Arrange a set of data in order of size, and the number in the middle is called the median of the set of data.
concept of majority
Among a set of data, the data that appears most frequently is called the mode of this set of data.
Think: Why is the average employee income at this company much higher than the median?
Connections: They describe the central tendency of a set of data from different perspectives.
Difference: When calculating the average, all data participates in the calculation. It can make full use of the information provided by the data, but it is easily affected by extreme values. It is the most widely used.
The advantage of the median is that it is simple to calculate and only depends on its position in the data. But not all data information can be fully utilized.
The mode is only related to the number of times it is repeated in the data, and is often not unique. However, all data information cannot be fully utilized, and when the number of repetitions of each data is approximately equal, the mode often has no special meaning.
Definition: In a set of data, the data that appears most often is called the mode of this set of data.
Note: (1) The mode is the data that appears most frequently in a set of data. It is the original data in a set of data, not the corresponding number.
(2) Sometimes there is more than one mode in a set of data. For example, in the data 2, 3, -1, 2, 1, and 3, both 2 and 3 appear twice. They are both the modes of this set of data.
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"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 2:
"Median and Mode" Data Analysis PPT Courseware 2 Diagnostic Exercise 1. 11 people from a biological interest group went outside the school to collect plant specimens. 2 people collected 6 pieces each, 4 people collected 3 pieces each, and 5 people each collected plant specimens. If one person collects 4 specimens, then each person in this interest group collects specimens on average ( )..
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Update Time: 2024-07-03
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