Basic standard

1. The scores of 8 students in the math group are as follows:

85 77 90 84 75 86 70 84

Find the average score of these eight students.

2. In a math exam, in the first group of grade five in Hongxing Primary School, three people got 100, four people got 96 points and the other five got 348 points. What is the average score of the first group in this math exam?

3. Yimin candy store with mixed sugar, * * * with 10 kg toffee per kg 24 yuan; 20 kg of soft candy per kg 18 yuan; 20 kg of hard candy per kg 12 yuan. How much does the mixed sugar cost at least one kilogram?

4. A workshop produced a batch of parts in June, with an average of 1200 pieces per day before12 days and 220 pieces per day after 18 days. Q: How many parts are produced on average every day in June?

5. A ship sails from A to B at a speed of 20km/h, arrives in15h, turns back immediately after arriving in B, and returns to A in12h. Find the average speed of the ship going back and forth.

6. Li Xiaohua got 87 points in Chinese in the final exam, and the average score in math and English was 96 points. What is his average score in three subjects?

The average of 7.5 numbers is 30. If these five numbers are arranged in numerical order from small to large, then the average of the first three numbers is 25, the average of the last three numbers is 35, and what is the middle number?

8. The sixth-grade students in a school donated money for Project Hope. The donation statistics are as follows:

(1) What is the average donation per class in the sixth grade of this school?

(2) What is the average donation per person in the sixth grade?

(3) How much more does Class Six and Class Three donate per person than Class Six and Class One?

innovate

1. The following table is the family population statistics of a residential building. Please calculate the average number of people in each household in this building.

2. The average of A, B, C and D is 38; The average of A and B is 42, and the average of E, P and D is 36. What's the number of B?

There are 40 students in a class, and two students missed the mid-term math exam because of illness. The 38 students who took the exam scored an average of 89 points, and the two students who missed the exam scored 99 points each after making up the exam. What is the average score of the mid-term exam in this class?

4. Three people, A, B and C, paid the same money to buy a batch of saplings. When distributing saplings, Party A takes 1 100 more than Party C, and Party B takes 700 more than Party C. When settling accounts, how much does Party A give to Party C 1800 yuan, and how much does Party B push to Party C?

The store bought two kinds of clothes recently, and the number of the second kind of clothes is four times that of the first one. One for Class A clothing 120 yuan and one for Class B clothing in 80 yuan. How much is the latest clothes on average?

6. 20 children in a small kindergarten class share cookies with 30 children in a large kindergarten class. Children in small classes share 10, while children in large classes share fewer cookies than those in large and small classes.

The average number of friends is 2 more. How many cookies did a * * * share?

A collection of interesting questions

1. Party A and Party B go fishing by the river. Party A caught 7 fish and Party B caught 1 1 fish. At noon, a tourist came. Party A and Party B cooked the fish and divided it into three parts on average. After dinner, the tourists paid 6 yuan money to people from Party A and Party B. How much did Party A and Party B take?

2.5 The judges graded a player, excluding a highest score and a lowest score, with an average score of 9.55. If only one highest score is removed, the average score is 9.46; If only one lowest score is removed, the average score is 9.66. What's the difference between the player's highest score and the lowest score?

3. The school held a math contest. Originally planned, there were 20 first prizes 10 and 20 second prizes. Now the last four people in the first prize are adjusted to the second prize, so the average score of the second prize students is increased by 1 point, and the average score of the first prize students is increased by 3 points. Is the average score of the first prize less than that of the second prize?

4. A school has 1 0,000 people taking the college entrance examination. Results 1.50 people were admitted. The difference between the average scores of the admitted students and the unaccepted students is 38 points. The average score of all candidates is 55 points, and the average score of admitted students is 7.3 points higher than the admission score. What is the admission score?