Suppose the time spent by a randomly selected student who uses a terminal connected to a local time-sharing mini-frame computer facility has a gamma

Suppose the time spent by a randomly selected student who uses a terminal connected to a local time-sharing mini-frame computer facility has a gamma distribution with mean = 20 minutes and variance = 80 minutes.a. What are the values of alpha and betab. What is teh probability that a student uses the trminal for at most 24 minutes?c. What is teh probability that a student spends between 20 and 40 minutes using the terminal