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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 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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