suppose that a gas station the daily demand for a regular gasoline is normamly distributed with a mean of 150000 gallons and a standard deviation of 18500 gallons. the station manager has just opened the station for business and finds that there are exactly 120000 gallons of regular gasoline in storage. the next delievery is scheduled later today at the close of business. the manager would like you to tell him the probability that there will be enough gasoline to satisfy todays demand. calculate this probability