0-20. 1220-40. 1540-60. 32 60-80. K80-100. 13Mean=53Find k

1.	0-20. 1220-40. 1540-60. 32 60-80. K80-100. 13Mean=53Find k
Answer» Mean= 53To find- kMean= sum of frequency×mid value÷sum of frequencySum of frequency= 12+15+32+13+k=72+kSum of frequency×mid value =10×12+30×15+50×32+70×k+90×13= 3340+70kNow put all the values in the formula of mean= 53=3340+70k÷72+k= 53(72+k)= 3340+70k= 3816+53k = 3340+70k= 3816-3340= 70k-53k= 476= 17k= k = 476÷17= k = 28

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