Assume that 20% of a very common insect species in you study are is parasitized assume that insects are parasitized independently of each other if you collect 10!specimen of this species what is the probability that no more than 2 specimen in your sample are parasitized Solution Binomial distribution is used. P(parasitized) = p = 20% = 0.2 q = 1-p = 1-0.2 = 0.8 n = 10 P(r) = nCr*q^(n-r)*p^r Required probability = P(r.