professor polling organization face the challenge of selecting a representative sample of U.S.Adults by telephone. This has been complicated by people who only use cell phones and by others whose landline phones are unlisted. A careful survey by Democracy Corps determined the following proportions: Cell phone only 39% Both cell and landline 29% Landline only listed 22% Landline only unlisted 7% a. What's the probability that a randomly selected U.S. Adult has a landline? b. What's the probability that a US adult has a landline given that he or she has a cell phone? c. Are having a cell phone and a landline independent?Explain. d. Are having a cell phone and a landline disjoint?Explain