The probability that roger wins a tennis tournament is 0.75 (event a), and the probability that stephan wins a golf tournament is 0.64 (event b). the probability that both roger and stephan win their respective tournaments is 0.48. which statement is true? events a and b are independent because p(a and b) = p(a) p(b). events a and b are independent because p(a and b) = p(a) + p(b). events a and b are dependent because p(a and b) = p(a) p(b). events a and b are dependent because p(a and b) = p(a) + p(b). events a and b are dependent because p(a and b) p(a) p(b).