any help would be greatly appreciated

A student wants to go to the gym, but it hard to find time between work and classes. Through observation, student has established a probability distribution of a time he will be able to attend gym during the week. X P(x) 2 0.4 3 0.3 4 0.2 5 0.1 a. What is the highest limit of a probability function? b. What is the probability the student will be able to go to the gym more than 2 hours per week P(x > 2)