This chapter only involves the operation process of the block diagram of the college entrance examination, that is to say, as long as you can follow the block diagram, you can work out the final result.

In the compulsory 3-module exam, the test sites are:

1. There are three ways to express the algorithm, namely description method, block diagram method and computer program method.

2. Three structures of block diagram.

3. Drawing the block diagram of the most basic problems, such as exchanging numerical values, solving equations by dichotomy and solving quadratic equations in one variable.

4. Computer statements will be written according to the block diagram, with emphasis on until-type and when-type loop statements, IF statements, etc.

5. Examples of algorithms, such as division by phase, subtraction by phase and digital system conversion.

Chapter II Statistics

In the college entrance examination, this chapter focuses on statistical charts and several descriptive values commonly used in statistics.

The test center of the module exam is:

1. Three sampling methods. Especially the application of individual selection and stratified sampling in systematic sampling.

2. Three commonly used statistical values, namely average, mode and median. Then, on this basis, the frequency distribution histogram and stem-leaf diagram are drawn to understand the overall density curve.

3. Variance and standard deviation.

4. The basic principle of linear regression. The formula of least square method need not be remembered.

Chapter III Probability

The test sites in this chapter are:

1. Definition of frequency and probability.

2. Classification of events, such as mutually exclusive events and opposing events. Then we will use the basic formula of probability.

3. Classical probability. Here, just write out the number of events by enumeration.

4. Geometric probability. The emphasis is on the example of delivering newspapers at the back of textbooks. This kind of problem is not easy to understand, and more efforts are needed.

In fact, the college entrance examination often tests classical probability.