Hello

p(beef contains bacteria) = 0.3 = 30%

p(beef does not contain bacteria) = 1-0.3 = 0.7

Now use the Binomial distribution

Jane bought 15 beefs, 2 are infected, therefore you need the propabilty: 1 beef is infected and 0 beef is infected

p("less than 3 beefs are infected") = p("0 or 1 or 2 beefs are infected") =