1. In order to understand the mid-term math examination of students in Grade Two 1 100 in our school, 200 students' math scores were selected for statistics. Make the following judgments: ① The survey method is sampling survey; ② 1 100 students as a whole; ③ Each student's math score is individual; ④ There are 200 students as the overall sample, and there are () correct judgments.

A. 1

Display analysis II. The statistics of the mid-term exam of a math class are shown in the figure, which shows that this course has

50

Ladies and gentlemen, the score has come out.

90

-

99

Duan has the largest number of people. 3. The sum of Xiaohua's midterm math and English scores is 180. The final exam score of mathematics is 20% higher than the mid-term exam score, and the English score is 10% lower than the mid-term, and the sum of the two subjects reaches 189. How did Xiaohua do in math and English midterm? Display and analysis. There are 60 students in a class, and 6 of them got full marks in the midterm math exam. In the fan-shaped statistical chart, the fan-shaped central angle representing the full score in the math exam is

36

Display analysis 5. A classmate got 76 points in the final math exam last semester, but he got 90 points in the math exam at ordinary times and 80 points in the mid-term math exam. If the total grade of the semester is calculated according to the usual grade of 20%, the mid-term grade of 30% and the final grade of 50%, then the total grade of the semester is

80

Since a school standardized its school-running behavior, it has been stipulated that students' usual homework, mid-term evaluation and final evaluation should be included in the total grade of the semester at the ratio of 2: 1: 2 respectively. Xiao Ming's math scores in homework, mid-term evaluation and final evaluation are 95 points, 93 points and 90 points in turn, so Xiao Ming's math total score this semester is

92.6

7. Xiao Ming's math exam results for one semester are as follows:

Unit 1 Unit 2 Unit 3 Mid-term End

84 90 78 90 87

If the usual grades are calculated by the average score of three units, and the semester grades are calculated by 30%, 30% and 40% at ordinary times, mid-term and final, Xiao Ming's math grades are

87

8. The school stipulates that students' math final grade consists of three parts, accounting for 20% at ordinary times, 35% at mid-term and 45% at final. Xiaohong's final math scores are 92, 86 and 94 in turn, so Xiaohong's final math scores are

90.8

9. Xiao Ming's math test scores for one semester are as follows:

Unit 1 Unit 2 Unit 3 Mid-term End

82 80 78 90 85

If the usual grades are calculated according to the average scores of the three units, the semester grades are 30% at ordinary times, 30% at mid-term and 40% at the end of the term, then Xiao Ming's math grades are

Eighty-five

Sub-display analysis