UPSC NDA II 2010 Mathematics Paper

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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
 05
510
1015
1520
2025
2530
  3
12
x
35
y
4
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