'Suppose that 10 % persons in large group of people are obese. If persons are checked one by one, what is the probability that the 9i person is the third obese person?
Let a discrete random variable X have the following PMF: p(x) = k for x = 1,2, 0, otherwise: Find k.
In a class of 8 students, what is the probability that at least one was born in July?'