Question

An allergist claims that 50% of the patients she tests are allergic to some type of weed. What is the probability that (a) exactly 3 of her next 4 patients are allergic to weeds? (b) none of her next 4 patients is allergic to weeds?

Answer 1

0,623 both

Explanation:

50%^4(chances of not being alergic)=0,623

50%^3(chances of being alergic)x50%(chances of not being alergic)=0,623

since it's a 50%, it doesn't change

(I don't know if this is right cause i'm still in high school)