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0-20. 12 20-40. 15 40-60. 32 60-80. K 80-100. 13 Mean=53 Find k

    • Posted by Mansi Kumari 6 years, 2 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Prachi Janwani 6 years, 2 months ago

    Mean= 53 To find- k Mean= sum of frequency×mid value÷sum of frequency Sum of frequency= 12+15+32+13+k =72+k Sum of frequency×mid value = 10×12+30×15+50×32+70×k+90×13 = 3340+70k Now 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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