Statistics 简明教程
Statistics - Cumulative Frequency
累积频率被定义为频率的累积总和。集合中某个元素的频率是指该集合中该元素的数量。累积频率也可以定义为到当前点为止所有先前频率的总和。
Cumulative frequency is defined as a running total of frequencies. The frequency of an element in a set refers to how many of that element there are in the set. Cumulative frequency can also defined as the sum of all previous frequencies up to the current point.
Example
Problem Statement −
Problem Statement −
以下数据集显示了某个冬令营参与者的年龄。为数据绘制累计频率表。
The set of data below shows the ages of participants in a certain winter camp. Draw a cumulative frequency table for the data.
Age (years) |
Frequency |
10 |
3 |
11 |
18 |
12 |
13 |
13 |
12 |
14 |
7 |
15 |
27 |
Solution −
Solution −
某个点的累积频率可以通过将该点的频率添加到前一点的累积频率来找到。第一个数据点的累积频率与其频率相同，因为它之前没有累积频率。
The cumulative frequency at a certain point is found by adding the frequency at the present point to the cumulative frequency of the previous point. The cumulative frequency for the first data point is the same as its frequency since there is no cumulative frequency before it.
Age (years) |
Frequency |
Cumulative Frequency |
10 |
3 |
3 |
11 |
18 |
3 + 18 = 21 |
12 |
13 |
21 + 13 = 34 |
13 |
12 |
34 + 12 = 46 |
14 |
7 |
46 + 7 = 53 |
15 |
27 |
53 + 27 = 80 |