Source: Official Guide Revised GRE 2nd Ed. Part 9; Section 5; #9


In a quality-control test, 50 boxes

In a quality-control test, 50 boxes—each containing 30 machine parts—were examined for defective parts. The number of defective parts was recorded for each box, and the average (arithmetic mean) of the 50 recorded numbers of defective parts per box was 1.12. Only one error was made in recording the 50 numbers: “1” defective part in a certain box was incorrectly recorded as 10. Quantity A : The actual average number of defective parts per box Quantity B : 0.94 Quantity A is greater., Quantity B is greater., The two quantities are equal., The relationship cannot be determined from the information given.

1 Explanation


Gravatar Chris Lele, Magoosh Tutor

Dec 8, 2012 • Comment

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