A large university uses some of the student fees to offer free use of its health center to all students. The following table displays the probability distribution function of the random variable X = number of times that a randomly selected student visits the health center during a quarter. X = No. of health center visits

0 1 2 3

? .25 .15 .05

QUESTION 1: Find P(X = 0) in the preceding table (represented by a question mark).

a. 0

b. 0.25

c. 0.30

d. 0.55

QUESTION 2: What is the probability that a randomly selected student visits the health center more than one visit per quarter?

a. 0.20

b. 0.25

c. 0.45

d. 0.55

I know the answers but would like to know the work to get there.

Thank you!