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*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 income of 40 persons*

*is 4200 and that of another*

*35 persons is 4000. The*

*average income of the whole*

*group is :*

*(1) 4100 (2) 4106 1/3*

*(3) 4106 2/3 **(4) 4108 1/3*

*(SSC CGL Prelim Exam. 04.07.1999*

*(Second Sitting)*

*8. 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)*

*9. The average marks of 32 boys of*

*section A of class X is 60 whereas*

*the average marks of 40 boys of*

*section B of class X is 33. The*

*average marks for both the sections*

*combined together is*

*(1) 44 (2) 45*

*(3) 46 1/2*

*(4) 45 1/2*

*(SSC Data Entry Operator*

*Exam. 02.08.2009)*

*10- 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)*

**Solution :-**