Please Help!
Assume that in any batch of soft drink bottles 25% are defective.
a) If we take a sample of 5 bottles from a case of 24, what is the chance that exactly 3 will be defective?
b) If we take a sample of 5 bottles from a case of 24, what is the chance that at least one will be defective?
c) If we take a sample of 5 bottles from a shelf with many, many bottles on it, what is the chance that exactly 3 will be defective?
d) If we take a sample of 5 bottles from a shelf with many, many bottles on it, what is the chance that at least one will be defective?
e) If we take a sample of 100 bottles from a shelf with many, many bottles on it, what is the chance that at least 25 will be defective?
f) If we take a sample of 100 bottles from a shelf with 500 bottles on it, what is the chance that a least 25 will be defective>
更新1:
please show the formula to me, I hard to understand. Thank you