Is the distribution of the number of HIV positive among the 20 users binomial? Why or why

Question:

Is the distribution of the number of HIV positive among the 20 users binomial? Why or why not?

Infectious Disease
A study considered risk factors for HIV infection among intravenous drug users [11]. It found that 40% of users who had ≤ 100 injections per month (light users) and 55% of users who had > 100 injections per month (heavy users) were HIV positive.

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...