1, and the ratio is the ratio between different types of data in the sample (or the whole). Because the ratio is not a local and global comparison, the ratio may be greater than 1.

2. Proportion is divided into scale and proportion. Two expressions with equal ratios are called proportions. Judging whether two ratios can form a proportion depends on whether their ratios are equal. The four numbers that make up a proportion are called proportional terms. The two terms at both ends are called external terms of proportion, and the two terms in the middle are called internal terms of proportion. In proportion, the product of two external terms is equal to the product of two internal terms, which is the basic property of proportion. The unknown term of finding proportion is called solution ratio.