According to Nielsen's Television Audience Report, 2010 & 2011, 26% of all U.S. TV house-holds have a

Question:

According to Nielsen's Television Audience Report, 2010 & 2011, 26% of all U.S. TV house-holds have a size of 1 person, 32% have a household size of 2,17% have a household size of 3, and 25% have a house-hold size of 4 or more. Let x represent the size (number of people) in a randomly selected TV household.
a. List the possible values of the discrete random variable x.
b. What is the probability that x = 1?
c. What is the probability that x ≥ 4?
d. Explain why you cannot compute E(x).