Probability that at least 4 of the 20 users are hiv

Hiv infection among intravenous drug users. Found that 40% light users and 55% were heavy users were HIV positive.

1) Suppose we have a group of 10 light users and 10 heavy users. What is the probability that exactly 3 of 20 users are HIV positive.

2) Probability that at least 4 of the 20 users are HIV positive?

3) Is the distribution of the nmber of HIV possitive among the 20 users binomial? Why or Why not?

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Probability that at least 4 of the 20 users are hiv : hiv infection among intravenous drug users. found that 40 light users and 55 were heavy users were hiv positive.1

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