kl800.com省心范文网

# A-Level数学-直方图Histograms

A-Level 数学-直方图 Histograms
Revision: Histograms Histograms are similar to bar charts apart from the consideration of areas. In a bar chart, all of the bars are the same width and the only thing that matters is the height of the bar. In a histogram, the area is the important thing. Example Draw a histogram for the following information. …… (Ignore relative frequency for now). It is difficult to draw a bar chart for this information, because the class divisions for the height are not the same. The height is grouped 0-2, 2-4 etc, but not all of the groups are the same size. For example the 4-5 group is smaller than the 0-2 group. When drawing a histogram, the y-axis is labeled 'relative frequency' or 'frequency density'. You must work out the relative frequency before you can draw a histogram. To do this, first you must choose a standard width of the groups. Some of the heights are grouped into 2s (0-2, 2-4, 6-8) and some into 1s (4-5, 5-6). Most are 2s, so we shall call the standard width 2. To make the areas match, we must double the values for frequency which have a class division of 1 (since 1 is half of 2). Therefore the figures in the 4-5 and the 5-6 columns must be doubled. If any of the class divisions were 4 (for example if there was a 8-12 group), these figures

### A-Level数学-直方图Histograms.doc

A-Level数学-直方图Histograms - 三立教育 ap.sljy.com A-Level 数学-直方图 Histograms Revision: Histograms Histog...

### 【A-level数学】S1知识点及题型大放送.doc

2.Histogram Grouped data can be displayed in a histogram. Histograms ...A-LEVEL数学 中国学生首... 暂无评价 1页 免费 A-Level数学-直方图Hist.....

### 高中数学直方图.doc

. (1) 求图中 a 的值 (2) 根据频率分布直方图,估计这 100 名学生语文成绩的平均分; (3) 若这 100 名学生语文成绩某些分数段的人数 ? x ? 与数学成绩...

### 高一人教版数学直方图.ppt

(2)画出频率分布直方图、频率分布 折线图. 课堂小结: 1.频率分布直方图 2

### 12.9频率分布、直方图与概率密度曲线.ppt

12.9频率分布、直方图与概率密度曲线_数学_自然科学_专业资料。频率分布直方图的作图步骤,概率密度函数的概念,根据密度函数求概率。 ...