How to review statistics and probability in junior high school mathematics

In junior high school, statistics and probability are not the key points, but to study and review, you only need to know about it.

Cartography: Statistical charts are necessary and the focus of review. Bar chart, fan chart and broken line chart, in which broken line chart refers to lines connected by many points and looks like many linear functions.

Arithmetic: The second focus of statistics is counting. We should know the average, weighted average, median, mode and extreme value. Extreme value refers to the data in a set of data that is very different from the rest.

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