I've been re-working two problems since yesterday, and have been getting the same (wrong) result every time. Here are the problems:
The probability that a person in the US has type B+ blood is 9%. Five unrelated people in the US are selected at random.
a) Find the probability that all 5 have type B+ blood.
Here, I would convert 9% to .09. Then,
HOWEVER: the answer key says it is .0000059
b) Find the probability that none of the five types have type B+ blood.
HOWEVER: the answer key says it is .624
c) Find the probability that at least one of the five has type B+ blood.
HOWEVER: the answer key says it is .376
The second problem confused me from the get-go. Would you mind giving me a hint on how to start it?
A distribution center receives shipments of a product from 3 different factories in the following quantities: 50, 35, and 25. Three times a product is selected at random, each time without replacement. Find the probability that:
a) All three products came from the third factory?
b) None of the three products came from the third factory?
Thanks in advance!