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Arithmetic Aptitude :: Average

  1. The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
  2. A.
    47.55 kg
    B.
    48 kg
    C.
    48.55 kg
    D.
    49.25 kg

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  3. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
  4. A.
    250
    B.
    276
    C.
    280
    D.
    285

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  5. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
  6. A.
    53.33
    B.
    54.68
    C.
    55
    D.
    None of these

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  7. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% of a mean score of 31. The mean score of remaining 55% is
  8. A.
    40.8 approx
    B.
    45.3 approx
    C.
    51.4 approx
    D.
    53.8 approx

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