Quote:
Originally Posted by Andrew87
Hi, I'm working on the 6th question but I can't get the solution.
I solved Q5 and I found a probability to get on just one sample (N=10) of 0.0047. Then to compute the probability to get at least one sample with , I modeled the number of samples with 0 red marbles with a binomial random variable . Hence, the probability I need is
and
Finally , so my closest answer is [3] = 0.550, however the solution report [c] as right answer. Where did I make a mistake ? Thank you in advance for your time (and sorry for my english).

I did the math and the probability that one sample has no red marbles, which is
evaluates to approximately 0.00034 rather than 0.0047.