Teaching objectives
1, knowledge and skills
(1) Understand the concept and significance of the average in the actual situation, and calculate the arithmetic average of a group of data.
(2) Calculator can be used to calculate the average and weighted average of a set of data.
(3) Understand the concept of weighted average under specific circumstances, understand the meaning of "weight", and know the connection and difference between arithmetic average and weighted average.
2. Process and method
Through the process of data collection and processing, the average and weighted average are used to solve some practical problems and cultivate students' mathematical application ability.
3. Emotions, attitudes and values
Cultivate students' ability to cooperate and communicate with each other, and enhance students' awareness of mathematics application.
Important and difficult
1, focusing on the calculation method of weighted average.
2. Difficulties: the principle of weighted average.