Question

55% of all pets sold at a pet store are dogs. One day, 10 people arrive at the store and purchase pets. (Note: One pet is purchased per person.) (a) What is the probability that exactly 3 of them are dogs? (b) If the store has only 7 dogs, what is the probability that they have sufficient dogs for sale that day?

Answer 1

55% of all pet 3 sold at a pet store are dog3. one day to people arrive at the store oood purchase pet3 Hin = 10 i p=0.55 € Probability that exactly 3 9 of them ar dog3 , PAX=3) = (tol (0.55}C1-0:5577 PIX=3) = (120)*0.1663) (0 :0037) P(x-3)= 0 0 +38 P (x - 1) - bị 20 mcdf ( 10 ,0 5 ,6) PCX5Z) = 69260.5)*(1-055) 3 PIX$7) = (120) * (0.015 22) Co:0911). P(X57) = 0.1663