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Authoritative PPT Summary
"Average" data analysis PPT, 28 pages in total.
Part One: Learning Objectives
1. Master the concepts of arithmetic mean and weighted average, and be able to find the arithmetic mean and weighted average of a set of data. (emphasis)
2. Be able to use arithmetic mean and weighted average to solve real-life problems. (difficulty)
Average PPT, part 2: teaching new lessons
arithmetic mean
Question: When you hear statements such as "Xiao Liang's height is above average in the class", "The members of basketball team A are younger than team B", have you thought about the meaning of these words? Do you know how people make this judgment?
In mathematics, we often use mean, median, mode, variance, etc. to analyze and characterize data.
think about it
What factors affect the results of the competition?
How to measure the height of two team members?
How do you understand "the members of Team A are taller than those of Team B"?
What data needs to be collected to compare the heights of players on two teams?
weighted average
In practical problems, the "importance" of each data in a set of data may not be the same. Therefore, when calculating the average of this set of data, each data is often given a "weight".
Average PPT, Part 3: Practice in class
1. (1) In a certain exam, the average score of 5 students is 82. Except for A, the average score of the other 4 students is 80. Then A’s score is ( )
A.84 B. 86 C. 88 D. 90
(2) If the average of m numbers is x and the average of n numbers is y, then the average of these (m+n) numbers is ( )
A.(x+y)/2 B.(x+y)/(m+n)
C.(mx+ny)/(x+y) D.(mx+ny)/(m+n)
Average PPT, Part 4: Class Summary
arithmetic mean
weighted average
Keywords: Free download of Beijing Normal University edition eighth-grade mathematics PPT courseware for the first volume, mean PPT download, data analysis PPT download, .PPT format;
For more information about the "Analysis of Data Average" PPT courseware, please click the "Analysis of Data PPT Average PPT" tab.
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