Saturday mornings are busy times at the Webster Aquatic Center. Swim lessons ranging from the Red Cross Level 2, Fundamental Aquatic Skills, through the Red Cross Level 6, Swimming and Skill Proficiency, are offered during two sessions.

Number of People in Number of People in Level 10:00 AM Class 11:00 AM Class 2 16 16 3 15 11 4 9 7 5 8 3 6 0 3 Lauren, the program coordinator, is going to randomly select one swimmer to be interviewed for a local television spot on the center and its swim program. What is the probability that the selected swimmer is in the following:

a. A Level 4 class

b. The 10:00 AM class

c. A Level 3 class given it is the 10:00 AM session

d. The 11:00 AM class given it is the Level 5 class