Binomial distribution problem.Originally Posted byswoopesjr01

Out of every books signed out are returned damaged and is not

returned at all. So of every books returned are damaged so the probability

that a returned book is damaged is

Of books returned the probability that exactly are damaged is:

Ooops - the above is the probability that of four returns two are damaged- No in retrospect this is right

irrespective of how many were signed out.

I just managed to confuse myself when rereading the explanation as it is not

clear enough. There is a clearer (at least I think so) explanation in one of my

later posts.

Simulation shows that the proper probability has about chance of being in the interval

Now if the question had been:

a) if 4 people each sign out one book, what is the probability that exactly 2

of the books will be returned damaged?

Then the answer would be:

RonL