"Weighted Average" PPT Courseware 2

Description

"Weighted Average" PPT Courseware 2

Students in grades 1 and 8 practiced laser simulation shooting at the practice base. Their 5 shooting results were as follows (unit: ring):

6, 8, 9, 7, 10

Can you calculate this classmate's grade point average?

Solution: 6+8+9+7+10/5=8 (ring)

Therefore, this student’s average shooting score is 8 rings.

In the formula for calculating the weighted average, what is the sum of the weights of all data? Compare the meaning of the weighted average with the average you have learned before. Can you tell what the connection is between the two?

Connection: In a set of data, when the number of occurrences of each data is regarded as 1, the weighted average of this set of data is the average learned in the past.

use as you learn

In a health inspection at the school, the classroom hygiene score of Class 1 in Grade 8 was rated at 85 points, the environmental hygiene score was rated at 90 points, and the personal hygiene score was rated at 95 points. If the three scores are included in the total score at 30%, 40% and 30% respectively, find the total score of the class's health inspection.

Solution: From the meaning of weighted average, we get

85×30%+90×40%+95×30%=90 (points)

Therefore, the total score of Class 1 of Grade 8 in this health inspection is 90 points.

Have you learned it?

1. A shooter shoots the target 20 times in a row, including 10 rings 2 times, 9 rings 7 times, 8 rings 8 times, and 7 rings 3 times. Find the average number of rings each time (accurate to 0.1 ring).

2. The results of a certain physical education test in Class 1 of the eighth grade were: 5 people scored 50 points, 9 people scored 60 points, 12 people scored 70 points, 9 people scored 80 points, 4 people scored 90 points, and 1 person scored 100 points. Find the average score of the class on this test.

Operation

(1) Questions 1 and 2 of Exercise 4.1 on textbook P118.

(2) Students who have room to learn should study P116 "Challenge Yourself" in the textbook.

Keywords: Weighted average teaching courseware, Qingdao edition eighth grade mathematics volume PPT courseware download, eighth grade mathematics slide courseware download, weighted average PPT courseware download, .PPT format;

For more information about the "Weighted Average" PPT courseware, please click the "Weighted Average ppt" tab.

"Average and Weighted Average" PPT courseware 3:

"Average and Weighted Average" PPT courseware 3 (1) Observation and thinking Divide an experimental field into 8 equal areas, each 100m2, and try to plant two different varieties of wheat under the same conditions of soil fertility, fertilizer, management, etc. , the output is as follows: 1. From Figure 261..

"Average and Weighted Average" PPT Courseware 2:

"Average and Weighted Average" PPT Courseware 2 When calculating the weighted average based on the frequency distribution table, the ________ of each group is commonly used in statistics to represent the actual value of each group, and the ______ of each group is regarded as the value in the corresponding group The right of value. 1. (4 points) Among the following sets of data, in the group...

"Average and Weighted Average" PPT courseware:

"Average and Weighted Average" PPT courseware 1. Generally, we call the ratio of the sum of n numbers x1, x2, and xn to n the arithmetic mean of these n numbers. The abbreviated mean is recorded as x and pronounced as x. 2. The importance of each data in a set of data is not necessarily the same...

File Info

Update Time: 2024-09-23

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

Preview