use matlab to calculate the probabilities(i need the code)

the requirement is that the probability of error is no great than 0.001. there are 5000 trials, and there will only two possible results: error and no error. how many failures should the equipment manufacture be allowed in order that the probability of passing the test be 0.98?

This sounds like a fairly straightforward Binomial distribution (unless I am mis-understanding the question). If you have the Statistics Toolbox, search the Matlab help for "Binomial distribution" and you will find several functions related to this distribution.