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UPSC NDA I 2010 Mathematics Paper

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Directions (Qs. No. 106-108) : Follow the table given:
The table below gives an incomplete frequency distribution with two missing frequencies f1 and f2
 Value of X  Frequency
 0   f1
 1  f2
 2  4
 3  4
 4  3
The total frequency is 18 and the arithmetic mean of X is 2.
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