A) find the probability that a student felt well rested, B) find the probability that a student did not go to sleep on time, or did feel well rested, or both, C) what is the probability that the fellow student went to sleep on time?, D) what is the probability a student both does not feel well rested and did not go to sleep on time?

Suppose that 40% of students go to sleep on time. If a student went to sleep on time, the probability that they felt well rested was 0.90. Further, the probability that a student both did not go to sleep on time and felt well rested was 0.30