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Authoritative PPT Summary
"Understanding averages and methods of finding averages" PPT courseware for averages and bar charts
teaching objectives
1. Combined with specific examples, go through the process of understanding averages, finding averages, and discussing the meaning of averages.
2. Have a preliminary understanding of the role of averages, be able to calculate averages, and understand the actual significance of averages.
3. Actively participate in mathematics activities and realize the fairness of using "average grade" to explain problems.
What can be done to make each pencil holder hold the same number of pencils?
Pencils: 15 pieces
Lead cylinder: 5 pcs
3 pencils is the average number of pencils in each of these 5 pen holders.
Four (1) groups of students from Class 1 and 2 will throw a ball, each throwing 10 balls.
How many people are in each group? How many shots did each person make?
Work in groups to calculate the average score of each group.
Explore new knowledge
Group 1:
(8+7+6+7)÷4
=28÷4
=7(pieces)
Second group:
(9+8+5+3+5)÷5
=30÷5
=6(pieces)
Observe and tell me which group has better results?
The first group did well.
Because the average number of hits per person in the first group is more than the average number of hits per person in the second group.
In conclusion
The meaning of the average: The sum of all the data in a set of data divided by the number of the data in the set is called the average of the set of data.
How to calculate the average:
Average = total number ÷ total score
practice
1. The weight statistics of the fifth and sixth groups of students in Class 4 (1) of Xinhua Primary School are as follows. Calculate the average weight of the two groups of students respectively. (Unit: kilogram)
2. The sales of drinks in a "small" cold drink shop in a week are as follows:
(1) How many cases of drinks are sold on average per day?
(28＋14＋16＋18＋17＋22+25)÷7
=140÷7
＝20(box)
Answer: On average, 20 boxes of drinks are sold every day.
(2) The cold drink shop receives goods once a week. How many boxes of drinks is appropriate for the "little" cold drink shop to prepare next week?
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