A certain commercial jet plane uses a mean of 0.15 gallons of fuel per passenger-mile, with a standard deviation of 0.01 gallons.
a. Find the mean number of gallons the plane uses to fly 8000 miles if it carries 210 passengers.
b. Assume the amounts of fuel used are independent for each passenger-mile traveled. Find the standard deviation of the number of gallons of fuel the plane uses to fly 8000 miles while carrying 210 passengers.
c. The plane used X gallons of fuel to carry 210 passengers 8000 miles. The fuel efficiency is estimated as X/(210× 8000). Find the mean of this estimate.
d. Assuming the amounts of fuel used are independent for each passenger-mile, find the standard deviation of the estimate in part (c).
(a) The number of passenger-miles is 8000(210) = 1,680,000. Let X be the number of gallons of fuel used. Then 
= 1,680,000(0.15) = 252,000 gallons.
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