"Data Collation" PPT Courseware 2

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"Data Collation" PPT Courseware 2

Observe and think

1. Aunt Li, a salesperson in the shopping mall, sold 20 pairs of telescoping shoes in one day. Record the size of each pair of shoes in the order of sales (unit: centimeters):

24.5 27 23.5 24 24.5 25 26 26 24 24.5

25 24.5 25 24.5 23.5 25 26 24 24.5

In order to clearly understand the number of telekinetic shoes of various sizes sold that day, how should the above data be organized?

2. What information can you get from this form? Do you have any good suggestions for arranging the next purchase plan?

From this, can you understand the significance of grouping data?

think about it

Do you have any other grouping methods for the above questions?

Therefore: Grouping is to divide all the collected data into several groups according to certain standards.

The advantage of grouping is that by grouping and organizing messy data, the overall distribution of the data can be clearly understood.

1. The following data is a survey record of the birth months of 50 students in a seventh-grade class:

2, 12, 9, 8, 11, 5, 7, 11, 6, 4,

11, 8, 5, 7, 2, 7, 2, 12, 1, 9,

9, 11, 3, 8, 6, 3, 10, 8, 11, 5,

12, 2, 4, 7, 8, 1, 9, 10, 5, 3,

8, 6, 12, 3, 8, 10, 4, 7, 9, 12.

(1) Please regroup the above data so that the whole class can see at a glance the number of births per month.

(2) Based on the results of grouping, please tell me immediately how many students in this class have birthdays this month (October)?

Class summary

1. After studying this lesson, what do you know about the methods of collecting data?

The basic methods for collecting data include observation, statistics, survey, experiment, literature review or Internet query, etc.

2. How to group data appropriately?

According to the specific situation of statistics (needs) and (data range), divide the range of (data) into (several groups) and arrange them into tables according to (a certain order);

Count the number of (original data) in each group and fill in the statistical table.

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Update Time: 2024-10-31

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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