Problem 1 [ 30 points]
A company has 15 employees: 10 women and 5 men. A group of 4 employees is chosen at random.
(a) [15 points] What is the probability that the group contains only men?
(b) [15 points] What is the probability that the group contains at least 3 women?
Solution: Let \( X \) be the number of men in the group. \( X \) has hypergeometric distribution with parameters \( N=5, M=10, n=4 \). Hence: (a)