Changes

*It is also called Pascal distribution.  

*It is also called Pascal distribution.  

This is the statistical experiment with the following conditions:

This is the statistical experiment with the following conditions:

#This experiment consists of a sequence of independent trials.

This experiment consists of a sequence of independent trials.

#Each trial represents only two results(Success or failure)

Each trial represents only two results(Success or failure)

#The probability of success is constant from trial to trial

The probability of success is constant from trial to trial

#The trials are independent; that is, the outcome on one trial does not affect the outcome on other trials.

The trials are independent; that is, the outcome on one trial does not affect the outcome on other trials.

#The experiment continues until r successes are observed,  where r is a specified positive integer.  

The experiment continues until r successes are observed,  where r is a specified positive integer.  

*The random variable of  x = the number of failures that precede the rth success;  

*The random variable of  x = the number of failures that precede the rth success;  

*x is called a negative binomial random variable because, in contrast to the  

*x is called a negative binomial random variable because, in contrast to the