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UPSC NDA II 2010 Mathematics Paper

Directions (Q.No. 7-10): The frequency distribution of life of 90 TV tubes whose median life is 17 months is as follows:

Life of TV tubes (in months)	No. of TV tubes
$0-5$ $5-10$ $10-15$ $15-20$ $20-25$ $25-30$	$3$ $12$ $x$ $35$ $y$ $4$

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