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

Question : 9 of 120

Marks: +1, -0

What is the cumulative frequency of the modal class?

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