The document discusses various statistical concepts including pie charts, bar charts, histograms, cumulative frequency, mean, median, outliers, and mode. It notes that pie charts show the relative frequency of different categories, bar charts show counts without gaps between bars like histograms, and cumulative frequency accumulates values over time. It also explains that mean is the average, median finds the middle value after sorting data, and mode is the value that occurs most frequently.

1. Statistics
note

2. Software can’t think for you
•

3. Pie Charts
• 片slice大，说明频率frequency高

4. Bar Charts

5. Histogram
• 跟bar charts不一样：无间隙

7. cumulative frequency 积累频率
• 不停累积数值

8. 趋势

9. Mean 平均值
•

10. • outliers 异常值

11. Finding the median 找中位线
• 方法：排序，找中间值

12. mean and median exercise
• If you had to pick one age to represent this
class, what would it be? Why?
– 两个不同的年龄段，不能只用一个数值来表示
• What if you could pick two ages instead?
Which two ages would you pick, and why?
– 2和32

13. mode
• 频率最高的叫mode