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SWARAN SINGH COMMITTEE. #Fundamentalduties OBJECTIVE SCIENCE QUIZ FOR ALL COMPETITION SERISE 44
  1. 1. A student was asked to find the
    arithmetic mean of the following
    12 numbers :
    3, 11, 7, 9, 15, 13, 8, 19, 17,
    21, 14 and x
    He found the mean to be 12. The
    value of x will be :
    (1) 3 (2) 7 (3) 17 (4) 31
    (SSC CGL Prelim Exam. 04.07.1999
    (First Sitting)
    2. The average of the marks obtained
    in an examination by 8 students
    was 51 and by 9 other students
    was 68. The average marks of all
    17 students was :
    (1) 59 (2) 59.5
    (3) 60 (4) 60.5
    (SSC CGL Prelim Exam. 04.07.1999
    (First Sitting)
    3. If the average marks of three
    batches of 55, 60 and 45 students respectively is 50, 55 and
    60, then the average marks of all
    the students is
    (1) 54.68 (2) 53.33
    (3) 55 (4) None of these
    (SSC CPO S.I. Exam. 12.01.2003
    4. The average of 30 results is 20
    and the average of other 20 results is 30. What is the average
    of all the results ?
    (1) 24 (2) 48
    (3) 25 (4) 50
    (SSC CGL Prelim Exam. 11.05.2003
    (First Sitting)
    5. If the average weight of 6 students is 50 kg; that of 2 students
    is 51 kg; and that of other 2 students is 55 kg; then the average
    weight of all students is
    (1) 61 kg (2) 51.5 kg
    (3) 52 kg (4) 51.2 kg
    (SSC CGL Prelim Exam. 04.02.2007
    (Second Sitting)
    6. The average of 10 numbers is 7.
    If each number is multiplied by
    12, then the average of the new
    set of numbers will be
    (1) 7 (2) 19
    (3) 82 (4) 84
    (SSC CGL Prelim Exam. 04.02.2007
    (Second Sitting)
    7. The average weight of five persons sitting in a boat is 38 kg.
    The average weight of the boat
    and the persons sitting in the
    boat is 52kg. What is the weight
    of the boat ?
    (1) 228 kg (2) 122 kg
    (3) 232 kg (4) 242 kg
    FCI Assistant Grade-III
    Exam.05.02.2012 (Paper-I)
    East Zone (IInd Sitting)
    8- Total weekly emoluments of the
    workers of a factory is 1534.
    Average weekly emolument of a
    worker is 118. The number of
    workers in the factory is :
    (1) 16 (2)14
    (3) 13 (4)12
    (SSC CHSL DEO & LDC
    Exam. 27.11.2010)
    9. 12 kg of rice costing 30 per
    kg is mixed with 8 kg of rice costing 40 per kg.The average per
    kg price of mixed rice is
    (1) 38 (2) 37
    (3) 35 (4) 34
    (SSC CHSL DEO & LDC
    Exam. 28.11.2010 (Ist Sitting)
    10. A library has an average number
    of 510 visitors on Sunday and
    240 on other days. The average
    number of visitors per day in a
    month of 30 days beginning with
    Sunday is :
    (1) 285 (2) 295
    (3) 300 (4) 290
    (SSC CHSL DEO & LDC Exam.
    21.10.2012 (IInd Sitting)


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