The time in minutes until the next bus departs a major bus depot

The time in minutes until the next bus departs a major bus depot follows a distribution with f(x)=1/20 where x goes from 25-45 minutes.

a.whats the random variable? X=?
c. graph the probability distribution. someone please explain how
to do this?
g.find the probability that the time is at most 30 minutes. Sketch and label a graph of the distribution. shade the area of interest. write answer in a probability statement. How do i graph this? and is the probability statement P(x<30)
i.P(25<x<55)=? state this in a probability statement and draw the picture. How do i draw the picture?
SOMEONE HELP i missed class and im so lost

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