1. "With one method of a procedure called acceptance sampling, a sample of items is randomly selected without replacement and the entire batch is accepted if every item in the sample is okay. A company has just manufactures 837 CDs, and 339 are defective. If 7 of these CDs are randomly selected for testing, what is the probability that the entire batch will be accepted?"
-I tried 837-339, then dividing it by 7, but apparently that's not correct.
2. A basket contains 11 eggs, 4 of which are cracked. If we randomly select 5 of the eggs for hard boiling, what is the probability of the following events?
a. All of the cracked eggs are selected.
b. None of the cracked eggs are selected.
c. Two of the cracked eggs are selected.
-I've done this one over and over. Sometimes I get 1 right, sometimes 2, but never all of them. What am I doing wrong?!