In a certain truckload of apples 30% of the apples are rotten. if 12 are chosen at random, what is the probability that less than 3 of them are rotten?

Question

 I know how to do conditionals somewhat but this confuses me because i dont know the amount of apples.

Answer 1

less than three would be the same as adding together P(x = 0) + P(x = 1) + P(x = 2). doing that using a binomial calculator i find

0.0138 + 0.0712 + 0.1678 = 0.2528

meaning that the probability that less than 3 of the apples are rotten is about 0.2528