Reference model essay: (I found it online for reference only)
With the development of science, mathematics is more and more widely used in life, and the mathematics of life is everywhere. As an important part of mathematics, probability is also playing a more and more extensive role. Sampling survey, evaluation, lottery, insurance, etc. It is often necessary to calculate the probability. For example, 2,500 people of the same age have participated in life insurance in an insurance company. The one-year death probability is 0.002, and each person pays the insurance premium for one year 12 yuan. At the time of death, the family members can get 2000 yuan paid by the insurance company. Ask the insurance company what is the probability of profit, and the company is not less than 654,300. At first glance, it is difficult to know whether the insurance company is profitable, but after the calculation of probability and statistics, we can know that the company is almost certainly profitable. A = {2500× 12-2000x