"Average" Data Representation and Analysis PPT (Lesson 2)

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"Average" Data Representation and Analysis PPT (Lesson 2)

Part One: Learning Objectives

1. Be able to read simple statistical charts in specific experiments and operations, and be able to solve some simple practical problems based on statistical tables.

2. Use averages to solve practical problems and deepen your understanding of the meaning of averages.

[Key Points] Averages can be used to compare, judge and predict things, thereby solving practical problems.

[Difficulty] Flexibly use basic quantitative relationship expressions to find averages.

Average PPT, part 2: exploration of new knowledge

Below is a statistical table of tickets sold by the Science and Technology Museum in one week.

Do you know the approximate average number of tickets sold per day in the past five days?

(1) Estimate the average number of tickets sold per day in the past five days?

Asked to estimate the average number of tickets sold per day in the past five days. It is an estimate of the average number of tickets sold in these five days.

From the number of tickets sold in these five days, it can be inferred that the average number of tickets sold in these five days must be greater than the minimum number of 640 and smaller than the maximum number of 1,300.

1300 is given to 300 for Tuesday, 100 for Monday, 990 for Thursday is given to 100 for Monday. In this way, approximately 900 tickets are sold every day.

(2) 1,700 tickets were sold on Saturday and 1,460 tickets were sold on Sunday. How has the average number of tickets sold this week compared with the average number of the previous five days?

According to the average number = total number ÷ total number of copies, it can be seen that the average number of tickets sold this week is:

(700+640+910+990+1300+1700+1460)÷7

=7700÷7

=1100

Average PPT, Part 3: Classroom Exercises

1. Uncle Wang runs along the circular track every day and records the running distance.

If Uncle Wang did not run on the 5th day, what changes did the average daily distance run in the first 5 days compare with the average daily distance run in the previous 4 days? Do the math.

Answer: The average daily distance run in the first 5 days was 1 kilometer less than the average daily distance run in the previous 4 days.

2. The following is the age of some Red Army veterans during the Long March (1934).

(1) According to the table above, count the number of people in each age group by drawing the word "正".

(2) Draw a statistical chart based on the statistical table.

(3) Answer the questions.

①The oldest among these Red Army grandfathers was __________, who was _________ years old at the time. There are ________ people under the age of 30, accounting for ________ of the surveyed population.

② Without calculation, can you estimate the approximate average age of these Red Army veterans back then?

Yes, the average age of the Red Army grandfathers was about 30 years old.

Average PPT, Part 4: Class Summary

Learn the meaning of average,

Understand the method of finding averages,

Use total quantity ÷ total number of copies,

Solve simple practical problems.

Average PPT, Part 5: Classwork

1. Fill in the blanks.

(1) Mingming read an extracurricular book. He read 17 pages on the first day, 23 pages on the second day, and 20 pages on the third day. He read ( ) pages on average every day.

(2) City Cinema sold 125, 143, 139, 149 and 134 tickets from Monday to Friday respectively. Average number of tickets sold per day during the five days ( )

(3) Uncle Li put the apples picked from three apple trees A, B, and C into 5 baskets. The average weight of each basket was 26 kilograms. It is known that 48 kilograms were picked from tree A and 39 kilograms were picked from tree C. Kilogram, ( ) kilogram was picked from tree B.

2. Single choice questions.

(1) A residential compound counts the electricity consumption of each household this month. Among them, 3 households use 40 kilowatt-hours of electricity, 4 households use 50 kilowatt-hours of electricity, and 5 households use 32 kilowatt-hours of electricity. The average electricity consumption per household is ( ).

A. 47 degrees B. 40 degrees C. 42 degrees

(2) The number of times that 10 students from a certain school participated in charity activities in one school year were 2, 1, 3, 3, 4, 5, 3, 6, 5, and 3 respectively. The average number of this set of data is ( ).

A. 3 B. 3.5 C. 4

(3) The heaviest child in the gifted kindergarten weighs 32.3 kg, and the lightest one weighs 23.6 kg. The average weight of these children may be ( ).

A. 34.5 kg B. 29.8 kg C. 21.4 kg

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For more information about the "Representation and Analysis of Average Data" PPT courseware, please click the Representation and Analysis of Average PPT Data PPT tab.

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Update Time: 2024-09-19

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