The difficulty coefficient is the standard to measure the difficulty of the exam, and the coefficient is between 0- 1. The smaller the coefficient, the more difficult the problem. 0.7 is very simple, 0.3 is very difficult, generally at 0.6.

The meaning of the test difficulty coefficient of 0.7 can be understood as the score rate. For example, this problem is very difficult. The difficulty value is 0.6, which means the average score is 10*0.6=6. It can also be understood as the proportion of people who can answer this question correctly, or in some teams. For example, the difficulty of a multiple-choice question is 0.6, which means that six out of ten people can answer correctly. The difficulty coefficient of 0.6 indicates that this problem belongs to the medium type, and the smaller the difficulty coefficient, the more difficult it is.

How to calculate the difficulty coefficient 1 and control the difficulty coefficient of examination papers in all subjects at about 0.75? 2. The "difficulty coefficient" of the test questions reflects the difficulty of the test questions, which is different from the difficulty (expressed by P). The greater the difficulty coefficient, the higher the test score, and the more difficult it is, the more equal to1-p. The difficulty coefficient can be understood as "easy". Difficulty coefficient of actual test questions: the actual situation after passing the exam.

There are six or five people in 10 who can write it. Explain that the topic applies to half of the people.