80
2. In order to understand a final math exam of grade seven in a city, the math scores of 1000 students were selected from 80,000 candidates for statistical analysis. The following statement is correct ().
A. This 1000 students is a whole sample. B. Every student's math score is individual.
Eighty thousand students is the total.
D. 1000 students are the sample size.
Display analysis 3. 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
Point, display and analysis 4. Xiao Ming's math exam results 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
5. 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
What is Xiao Ming's grade in the semester? If the average score of three units is calculated, the final grade will be calculated by 30%, 30% and 40%. The analysis shows that there are 45 students in Class 6 and Class 8 (1) and 50 students in Class 8 (2). In the final math exam, the average score of class (1) is 83.4, and that of class 2 is 8 1.5. The average score of these two classes is.
82.4
7. The school stipulates that the total evaluation score of each student in each period = the average score of the usual exam × 10%+ the mid-term exam ×30%+ the final exam ×60%. Xiao Ming usually scored 82, 85 and 85 in the three exams, 92 in the mid-term exam and 95 in the final exam, so Xiao Ming's total evaluation score is.
93
8. The school stipulates that students' math final grade consists of three parts, including 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. According to the regulations of a school, students' math final evaluation results consist of three parts. Usually, I participate in math group activities, accounting for 25%, my homework is completed for 35%, and my final exam results account for 40%. Xiaoming's math final evaluation scores are 84, 92 and 88 respectively.
88.4
Points. According to the analysis 10, the scores of a student's usual mathematics, mid-term exam and final exam are 84, 80 and 90 respectively. If you press it,