1. There are 36 kilograms of peaches, which are packed in two boxes respectively, with an average of () kilograms per box.
2. When making subsection statistics, subsection should be carried out reasonably according to the number of ().
3. Average is often used in life, ()? () = average.
The average of 4.96, 30 and 54 is ().
The sum of numbers A and B is 48, and the number C is 42. The average of these three numbers is ().
6. The average of A and B is 70, the number of C is 130, and the average of these three numbers is ().
7. The average of three numbers is 25, of which two numbers are 12 and 30 respectively, and the third number is ().
8. A set of data has two 45 s, five 30,65438+zero 40 s, and the average value of this set of data is ().
Second, the judgment question. (to the painting? , wrong painting? )
The average of 1.A and B is 75, the average of C is 90, and the average of these three numbers is 85. ( )
There are 32 teachers in Central Primary School, with an average age of 39. There must be 5 teachers over the average age. ( )
The average value of three numbers is 64, two of which are 92 and 47 respectively, and the third number is 53. ( )
4. The average height of Class One in Grade Four is 145 cm, and that of Class Two in Grade Four is 142 cm. Xiao Qiang is a student in Class One and Xiaoming is a student in Class Two. Xiao Qiang must be taller than Xiaoming. ( )
5.5 people donated 12 books and 5 people donated 8 books, with an average of 10 books per group. ( )
Third, multiple choice questions. (Put the serial number of the correct answer in brackets)
The average of 1. three numbers is 26, of which two numbers are 14 and 39, and the third number is ().
A.27 B. 3 1 C. 25
2. The average height of basketball players is 20 1cm. Li Choi Wha is one of the players, and his height () is 180cm.
A. Maybe B. Impossible C. Not sure
3. The average water depth of a river is 128 cm, and Xiaomei's height is 132 cm. She crossed the river, and the following statement is true ().
A. there must be danger. There will be no danger.
C. uncertainty
4. Mom spent 6 yuan on 3 kilograms of apples and 10 yuan on 5 kilograms of grapes, with an average of () yuan per kilogram of fruit.
A.3 B. 5 C. 2
Fourth, how to calculate as simply as possible.
102? 75 25? 43? 4 800? 4? 25 48.56-6.8 1-3. 19
5. Look at the pictures and fill in the blanks.
From 20 1 1 to 20 13, the statistics of industrial output value and agricultural output value in a certain area are as follows.
project
Amount (100 million yuan) Annual gross industrial output value and agricultural output value.
20 1 1 year 2.4 1.7
20 12 2.7 1.8
20 13 3.2 1.9
General plan
(1) Complete the statistics table.
(2) From 2011to 20 13 years, the total industrial output value in this area was () billion yuan more than the total agricultural output value.
(3) The agricultural output value in 2012 years is () billion yuan less than the industrial output value.
(4) The industrial output value in 2013 years is () billion yuan higher than that in 20 1 1 year.
(5) The gross industrial and agricultural output value in 2013 years is () billion yuan higher than that in 20 12 years.
(6) From 20 1 1 to 20 13, the average agricultural output value is () billion yuan per year.
Sixth, solve the problem.
1. How many kilometers does the car travel per hour on average?
2. The following is a record of a one-minute table tennis match for Class One, Grade Four.
1 group, group 2 and group 3
Number 4 4 4
Average number of bumps per person 72 56 58
(1) How many balls are there in each group?
(2) How many balls did the students participate in on average?
Uncle Wang travels by bike. When he went there, he traveled 2 1 km with the wind and arrived in 3 hours. When he came back, he spent four hours against the wind. What is the average speed of Uncle Wang's round trip?
4. Experimental primary schools hold singing competitions as follows.
First prize: 95~ 100 points
Second prize: 85~94 points
Third prize: 75~84 points
Encouragement Award: 65~74 points
Statistical table of male athletes' performance
Player Number Judge 1 Judge 2 Judge 3 Average Score
0 1 85 90 83
02 93 96 87
03 96 97 95
04 79 8 1 7 1
05 75 68 67
06 82 8 1 7 1
Statistical table of female athletes' performance
Player Number Judge 1 Judge 2 Judge 3 Average Score
0 1 78 68 70
02 79 82 73
03 88 94 9 1
04 98 94 99
05 82 78 83
06 84 90 84
(1) Fill in the average score of each player in the above table.
(2) Rank the scores of boys and girls in the following statistics.
Statistical table of singing competition results in experimental primary schools
Number of awards, gender first prize, second prize, third prize, encouragement prize
Male player
Female player
(3) Look at the statistics above, what do you find?
Reference answer
I. 1. 18 2. Data 3. Total number of copies 4. 60
5.30 6.90 7.33 8.35
Second, 1. 2.？ 3.？ 4.？ 5.？
Three. 1.C 2。 A 3。 C 4 explosive C
Four. 7650 4300 8 38.56
Verb (abbreviation of verb) (1) Ellipsis (2) 2.9 (3) 0.9 (4) 0.8 (5) 0.6
(6) 1.8 0.9
6. 1.(240+327)? (4+5) = 63km
2.( 1)(72+56+58)? 4? 3=248 (pieces)
(2)(72? 4+56? 4+58? 4)? (4+4+4)=62 (piece)
3.2 1? 3? 2? (3+4) =18km
4.( 1) Male: 86 92 96 77 70 78
Female: 72 78 9 1 97 8 1 86
(2) Male players: 1 2 2 1 female players: 1 2 2 1.
(3) The answer is not unique. For example, male players and female players win almost the same prize.