A Pew Internet Research study (April 2018) reported that 20% of US adults are now “smartphone only” Internet users at home—that is, they own a smartphone but do not subscribe to traditional broadband service where they live. Of these “smartphone only” users, 10% have a college degree and 28% are between the ages of 18 and 29 years.

a. What is the probability that a US adult is a “smartphone only” user of the Internet and has a college degree?

b. What is the probability that a US adult is a “smartphone only” user of the Internet and between the age of 18 and 29 years?

c. The US Census Bureau reports that 33% of US adults have a college degree. For a randomly selected US adult, are the two events, A = {“smartphone only” user} and B = {have a college degree} independent?