Friday, July 31, 2009

Challenging PROBABILITY Question - please help!!?

A student needs to know details of a class assignment that is due the next day and decides to call fellow class members for this information. She believes that for any particular call the probability of obtaining the necessary information is 0.40. She decides to continue calling class members until the information is obtained. Let the random variable X denote the number of calls needed to obtain the information.


a. Find the probability function of X.


b. Find the cumulative probability function of X.


c. Find the probability that at least three calls are required.





thanks in advance.

Challenging PROBABILITY Question - please help!!?
This is a binomial probability distribution with the probability of success = .4








a) P(i)= P(n%26gt;=1) from the binomial distribution for i trials - p(n%26gt;=1) from the binomial distribution for (i-1) trials.





b) P(n%26gt;=1) from the binomial distribution for i trials





c) P(n=0) from the binomial distribution for 2 trials


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