At present, the world population exceeds 6 billion. Life span: 80*365=29200 (days). On average, you can meet about 1000 people every day, and the total number of people you meet in your life: 29,200 *1000 = 29,200,000 people.
Chance of meeting: 29200000/6000000 = 0.00487.
Related information:
Introduce "probability" into the quantification of event possibility. Is there a stable value for the total number of independent repetitions n, event A frequency μ, event A frequency Fn(A)=μ/n, and event A frequency Fn(A)? If yes, the stable value p of the frequency μ/n is called the probability of the occurrence of event A, and it is recorded as P(A)=p (statistical definition of probability).
P(A) is objective, while Fn(A) depends on experience. In statistics, the value of Fn(A) is sometimes used as an approximation of probability when n is large.