The cross-sectional area of plastic tubing for use in pulmonary resuscitators is normally distributed with mean 12.5 mm^2 and standard deviation 0.2 mm^2. When the area is less than 12.0 mm^2 or greater than 13.0 mm^2, the tube does not fit properly. If the tubes are shipped in boxes of 1000, how many wrong-sized tubes per box can doctors expect to find?

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