1, mean is the sum of all data in a set of data divided by the number of data, and it is a statistical indicator reflecting the trend in a set of data. Average can be used to measure the concentration of data, and calculating average is one of the most basic analysis methods in statistics.
2. average formula: divide the sum of n numbers by n, and the quotient obtained is called the arithmetic average of these n numbers. An = (a1+a2+...+an)/n (an: the average of n, n: the number of people in this group, ai (1
3. There are other derivative forms of average, such as median and mode. Median is a numerical value that arranges a group of numbers in order of size and is located in the middle position, which can reflect the concentration trend of data. Mode is the highest frequency value in a group of data, which can reflect the distribution of data.
Ways to improve math scores:
1. Listen carefully in class and review after class.
The learning of new knowledge is mainly carried out in the classroom, so we must pay attention to the learning efficiency in the classroom, find a suitable learning method, and actively think according to the teacher's ideas in the classroom. Review and consolidate after class, and ask questions in time if you don't understand.
2. Do more questions and develop good problem-solving habits.
If you want to learn math well, it is inevitable to do a lot of problems. Only by mastering all kinds of questions can you effectively improve your math scores. At the beginning, we should lay a good foundation based on the exercises in books, and then gradually increase the difficulty, expand our thinking and train different types of problem-solving methods. For error-prone questions, we need to sort them out and review them constantly.
3. Adjust the mentality and treat the exam correctly.
In the exam, most of the questions are basic, and only a few are more difficult. Therefore, we must keep a good attitude, cheer ourselves up, be careful when doing the questions, don't be impatient, be prepared before the exam, do routine questions, and don't improve the speed of doing the questions in order to catch up with time.