1. According to a survey conducted by China Health Education Center, the correct hand washing rate of China residents is only 4%.
4% said that only 4 people in every 100 people can wash their hands correctly, which shows that the sanitary habits of Chinese residents need to be strengthened.
2. According to the recent health survey, the myopia rate in China is close to 30%, and 22.7% of primary school students suffer from myopia.
30% people said that 30 people per 100 people suffered from myopia, and 22.7% people said that at least 22.7 people per 100 people suffered from myopia, which shows that the problem of myopia in China is getting more and more serious and needs to be paid enough attention.
3.20 10 The sixth national census showed that the male population in Chinese mainland was about 105.2% of the female population.
105.2% means that every 100 female population corresponds to 105.2 male population. This data can be used to study the sex ratio of the population and analyze one of the causes of social problems such as population aging.
The application of percentage in mathematics;
1, percentage calculation: percentage is the unit used to calculate the proportion, which can help people quickly understand and compare the relationship between different data. For example, in finance, economy, sociology and other fields, percentage is often used to indicate the growth or change of data.
2. Statistics: In statistics, percentages are widely used to describe and compare data. For example, percentages can be used to describe the proportions of different categories in a sample, or to compare the proportions between different samples. The use of percentages can make the data more intuitive and easier to understand.
3. Discounts and rates: In business and trade, percentages are widely used in the calculation of discounts and rates. For example, if a commodity is 20% off, you can express this discount as a percentage, that is, 100% minus the discount ratio (80% or 20%). Using percentages can make these calculations simpler and more intuitive.
4. Probability and proportion: In probability theory and statistics, percentage is also widely used to express probability and proportion. For example, in the fields of finance and risk assessment. Percentage is often used to express probability and rate of return.