1.A randomized clinical trial was performed among children 3 to 8 years of age to study the effect of an influenza vaccine. Children received either a quadrivalent vaccine (QIV) or control vaccine. An attack rate (i.e. % of children who developed influenza) starting 14 days after vaccination until the end of the study was computed for each vaccine group by age. The attack rate for influenza by age groups is provided below (i.e. Table 3.7 in the book).

Age QIV Control

3-4 3.78% 5.69%

5-8 1.70% 5.15%

Supposed 3 children in a village ages 3, 5, and 7 are vaccinated with the QIV vaccine. What's the probability that at least one child among the 3 will get influenza?

I looked at the completed homework assignments but I didnt understand how they got the answers?

how do I solve for the probability of independent variables?