NDA2010MathematicsStatisticsActual

The frequency distribution of life of 90 TV tubes whose median life is 17 months is as follows: What is the lower limit of the median class?

Options

Correct answer

B. 15

Step-by-step solution

Clearly median class will 15-20 using formula M _ o =l+ N 2 -c . f . f i Also aligned 54+x+y & =90 x+y & =36...(i) aligned array rlrl Again & & 17 & =15+ 45-15-x 35 5 & & 2 & = 30-x y & x & =30-14=16 & y & =20 array

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