,theexpected number of crossings of the level a during unit time with positive slope (i.

The stationary probability density function (PDF) and the stationary mean out-crossing rate (MOR) of the response of ship nonlinear roll-motion subjected to additive stochastic white noise excitation are examined by a new approximate method in this paper.

The DBRD makes decision according to the real-time information,and the decision parameters are determined and optimized by using response surface method and desirability function approach.

This paper discusses classical model,formula of total probability,normal distribution,mathematic expectation and the central limit theorem.

The thesis sets up the ready-made flour-product sale profit model by putting forward the conditions on which the maximum mathematic expectation of profit is based.

This article is mainly on the basis of the binomial distribution,the multinomial distribution,in the negative binomial distribution foundation to promote the negative binomial distribution fatherly,to give the negative term distributed definition,to infer its probability distribution and to calculate its mathematic expectation and the variance.

A calculation for random variable mathematical expectation;

On direct methods to the mathematical expectation and variance in the matching problem