I don't understand this.

On hot, sunny. summer days. Jane rents inner tubes by the riverthat runs through her town. Based on her past experience, she has assigned the following probability distribution to the number oftubes she will rent on a randomly selected day. x 25 5-3 7-5 168 Total P(x) .18 .34 .35 .28 1.68 In] Find the probability expressions: (Round your answers to 2 decimal places} a. P(X = 25) b. P(X 5 59) c. P(X > 25) d. P(X