The probability of a student scoring 75% in class work is 0.64, and the probability of a student scoring 85% is 0.45. event a: the student scores 75%. event b: the student scores 85%. the probability of a student scoring 85% in class work, given that they have already scored 75% in class work, is 0.55. the probability of a student scoring 75% in class work, given that they have already scored 85% in class work, is 1. which statement is true? a. events a and b are independent because p(a|b) = p(a). b. events a and b are independent because p(a|b) = p(b). c. events a and b are independent because p(a|b) = p(a) + p(b). d. events a and b are not independent because p(a|b) ≠ p(a). e. events a and b are not independent because p(a|b) = p(a).