city law enforcement has state that 20% of items sold by paywn within city stolen john purchase 4 items from city pawn shop for x=the number of john purchase that have been stolen how I can determine:a P(x=0, b P(2<=x), cP(1-<x-<3) and d P(x-<2).. Try

Use a poisson distribution.

For more info, See:
http://en.wikipedia.org/wiki/Poisson_distribution

repost if you are still having trouble.