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The formula related to statistical investigation in the tenth chapter of seventh grade mathematics: 10. 1.
1. degree of central angle ÷ 360 = percentage of central angle.

2. Total number ÷ required number = percentage of required number.

3. Total number × percentage of requests = number of requests.

4.360× percentage of central angle = degrees of central angle.

This is what you have to do in the exam. Learn to use it flexibly.

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