Posted by **cedreana** on Saturday, June 18, 2011 at 8:08am.

From past experience, an airline has found the

luggage weight for individual air travelers on its trans-

Atlantic route to have a mean of 80 pounds and a

standard deviation of 20 pounds. The plane is

consistently fully booked and holds 100 passengers.

The pilot insists on loading an extra 500 pounds of fuel

whenever the total luggage weight exceeds 8300 pounds.

On what percentage of the flights will she end up having

the extra fuel loaded?

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