On average, Mark will use 5 gallons of gas while driving in…

On average, Mark will use 5 gallons of gas while driving in a single week. Mark wants to know the probability of of using no more than 25 gallons of gas in a 6-week period. What distribution should be used and what probability should be evaluated? (Give the proper distribution and probability notation. Use the tilde notation for the distribution. No computation is required. This is not a binomial distribution.)