At cruising altitude, a commercial jet engine consumes an average of 850 gallons of fuel per hour with a standard deviation of 48 gallons per hour. Assuming that the fuel consumption follows a normal distribution at cruising altitude, find the probability that the hourly fuel consumption is:
(a) Between 700 and 950 gallons,
(b) Less than 750 gallons,
(c) More than 1000 gallons.