The probabilities that a student will attain a 3.6 GPA, at least a 3.0 GPA, at least

Question:

The probabilities that a student will attain a 3.6 GPA, at least a 3.0 GPA, at least a 2.5 GPA, and at least a 2.0 GPA are .08, .47, .69, and .81, respectively. Find the probabilities associated with each of the following.
(a) A GPA worse than 3.0 but greater than 2.5
(b) A GPA worse than 2.0
(c) A GPA of at least 2.5
(d) A GPA worse than 3.0