Poisson probability distribution vaccination H1N1 i think?

Suppose that the probability of occurrence of adverse effects of vaccination against H1N1 is 0.001. If 1000 people are vaccinated, how do you find the probability that 1. the longer a person suffers from side effects? 2. 1, 2 or 3 people suffer?

yes. for such a low probability, you can use the Poisson distribution, but remember, you are using the Poisson approximation to the binomial of the Poisson formula is P [x] = e-μ) * μ (x ^ / μ = 0.001 x! here * 1000 Q1 = 1 we find P [0] + P [1] P [0] = e ^ (-1) * (1) ^ 0 / 0! P = 0.3679 [1] = E ^ (-1) * (1) ^ 1 / 1! If P = 0.3679 [at a] = P [0] + P [1] = 0.7358 q2 we have found P [1] = 0.3679 P you can find [2] and P [3] and even add up