If the probability that an individual suffers a bad reaction from an injection of a given serum is 0.001, determine the probability that out of 2000 individuals:
(I) exactly 3
(ii) more than 2
individuals will suffer a bad reaction.

More than 2

Hi Shreck.. in the above question we have to find the probability of the two cases i.e. exactly 3 and more than 2. Thanks for your help in advance!

Well,
if you have 2000 individuals and you need to know the probability that 3 individuals suffers a bad reaction you write this :

2000 per X = 3
so : 3/2000 = X
so the probability is 0.0015


for the other case I'm not really sure but I think at something like this :

2000 per X > 2
so X > 2/2000
so X > 0.001

tell me if I'm wrong, my mathematics are far far away...

Hi Shreck, I am really not sure about the answer because I do not have the answer for this particular question. I too think it should be 3/2000 but not sure where to use the probability of 0.001?