"Frequency Distribution Table and Histogram" PPT download

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"Frequency Distribution Table and Histogram" PPT download

Part One: Review and Review

Do you still remember the characteristics of each statistical chart:

Bar charts can clearly show the specific number of each item.

Line statistical charts can clearly reflect changes in things.

A fan chart can clearly show the percentage of each part in the whole.

Frequency distribution table and histogram PPT, part 2: drawing frequency distribution histogram

General steps for drawing a frequency distribution histogram:

(1) Calculation range: 95-53=42 (minutes)

(2) Determine the group distance and number of groups.

Range/group distance=42/10=4.2

The data is divided into 5 groups.

(3) Decide on points.

49.5~59.5, 59.5~69.5,

…89.5~99.5

(4) Column frequency distribution table.

(5) Draw a frequency distribution histogram.

The horizontal axis represents each group of data, and the vertical axis represents frequency. If the frequency within the group is high, a rectangle is drawn.

Summarize the method of drawing a histogram:

1. According to the size of the drawing, draw two mutually perpendicular rays and add arrows at both ends.

2. On the horizontal ray, appropriately allocate the positions of the bars and determine the width and spacing of the straight bars.

3. On the ray perpendicular to the horizontal ray, determine the unit length according to the size of the data, and then draw straight bars of different lengths according to the size and note the quantity.

Frequency distribution table and histogram PPT, the third part: the difference between bar chart and histogram

1. There are gaps between the rectangles in the bar chart, but there are no gaps between the rectangles in the histogram.

2. The horizontal axis data of the histogram is continuous and the position of the group is fixed, but the bar chart is not.

Randomly check the number of pulse beats per minute of 20 students and obtain the following data (unit: times):

81, 73, 77, 79, 80, 78, 85, 80, 68, 90,

80, 89, 82, 81, 84, 72, 83, 77, 79, 75.

untie:

(1) Column frequency distribution table: Frequency distribution table of the number of pulse beats per minute for 20 students

(2) Take the line segments with the two boundary points of each group on the horizontal axis as the endpoints as the base, and draw a rectangle with the height of the corresponding frequency to get the desired frequency distribution histogram, as shown in the figure:

Keywords: Free download of Hebei Education Edition mathematics PPT courseware for eighth grade volume 2, frequency distribution table and histogram PPT download, .PPT format;

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"Frequency Distribution Table and Histogram" PPT courseware:

"Frequency Distribution Table and Histogram" PPT courseware Part One: Preparation before class Questionnaire: Books are the ladder of human progress. What kind of books do students like to read most after class? A. Literature ( ) B. Comics ( ) C. Popular science ( ) D. History ( ..

"Frequency Distribution Table and Histogram" PPT:

"Frequency Distribution Table and Histogram" PPT Part One Content: New Lesson Exploration In order to understand the market share of different brands of beverages, Xiaoliang and Xiaoming chose a supermarket to conduct a survey and recorded the brands of beverages purchased by 50 customers that day. Use the letters K,B,L,C...

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Update Time: 2024-10-03

This template belongs to Mathematics courseware Hebei Education Edition Eighth Grade Mathematics Volume 2 industry PPT template

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