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10th Class Mathematics Sample Paper Sample Paper - 4 - Term - 1

  • question_answer
      The mean of the following frequency table is 53. But the frequencies and in the classes 20-40 and 60-80 are missing. Find the missing frequencies.
    Age (in years) 0-20 20-40 40-60 60-80 80-100 Total
    Number of people 15 21 17 100
    OR Find the median of the following frequency distribution :
    Marks Frequency
    0-100 100-200 200-300 300-400 400-500 500-600 600-700 700-800 800-900 900-100 2 5 9 12 17 20 15 9 7 4
     

    Answer:

      Let assumed mean a = 50 and h = 20
    C.I. Mid-value
    0-20 20-40 40-60 60-80 80-100 15 21 17 10 30 50 70 90 -2 -1 0 1 2 -30 0 34
         
                                                                        ?(1) Mean i.e., Adding (1) and (2)        ?(2) Putting the value of in   OR
    Age Frequency Cumulative frequency
    0-100 100-200 200-300 300-400 400-500 500-600 600-700 700-800 800-900 900- 1000 2 5 9 12 17 20 15 9 7 4 2 7 16 28 45 65 80 89 96 100
    Cumulative frequency just greater than  is 65 and corresponding class is 500-600.  median class is Hence, Median


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