| 摘要: | 
	         
			 
		     | 受Chvátal定理的启发,本文研究了随机变量不超过其期望的概率的下确界问题.利用分析的方法,我们得到了当随机变量的分布为Weibull分布或Pareto分布时该随机变量不超过其期望的概率的下确界. | 
	         
			
	         
				| 关键词:  Chvátal定理  Weibull分布  Pareto分布 | 
	         
			 
                | DOI: | 
           
            
                | 分类号:O211 | 
             
			 
             
                | 基金项目: | 
             
           | 
           
                | A STUDY ON THE WEIBULL AND PARETO DISTRIBUTIONS MOTIVATED BY CHVÁTAL'S THEOREM | 
           
           
			
                | 
				
				LI Cheng1, HU Ze-chun1, ZHOU Qian-qian2
						
				
				 | 
           
           
		   
		   
                | 
				
				1.College of Mathematics, Sichuan University, Chengdu 610065, China;2.School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
				
				 | 
           
		   
             
                | Abstract: | 
              
			
                | Motivated by Chvátal's theorem, in this paper, we consider the infimum value problem on the probability that a random variable is at most its expectation. By employing the analytical method, the results for a random variable with the Weibull distribution or the Pareto distribution are obtained. | 
            
	       
                | Key words:  Chvátal's theorem  Weibull distribution  Pareto distribution |