題組內容

1. Each bag in a large box contain 25 tulip bulbs. Three-fourths of the bags contain bulbs for 5 red and 20 yellow tulips; one-fourths of the bags contain bulbs for 15 red and 10 yellow tulips. A bag is selected at random and one bulb is planted. Give the probability that it will produce a

(b) \( (5\%) \) If the tulip is red, find the conditional probability that a bag having 15 red and 10 yellow tulips was selected.