Average Aptitude Questions Answers Problems – Page 2

Average Aptitude Questions Answers Problems Test Online MCQ – Page 2

Average 2

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Question 1
David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology. What are his average marks ? 
A
a) 65
B
b) 69
C
c) 72
D
d) 76
E
e) None of these
Question 2
In Arun’s opinion, his weight is greater  than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun’s weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of different probable weights of Arun ?
 
A
a) 67 kg
B
b) 68 kg
C
c) 69 kg
D
d) Data inadequate
E
e) None of these
Question 3
The average of 20 numbers is zero. Of them, at the most, how many be greater than zero ?
 
A
a) 0
B
b) 1
C
c) 10
D
d) 19
Question 4
Find the average of all the numbers between 6 and 34 which are divisible by 5.
A
a) 18
B
b) 20
C
c) 24
D
d) 30
Question 5
  The average of first five multiples of 3 is :
 
A
a) 3
B
b) 9
C
c) 12
D
d) 15
Question 6
 The average of the first nine prime numbers is :
 
A
a) 9
B
b) 11`
C
c) 11 -
D
d) 11
Question 7
A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What should be the number in place of x ?
 
A
a) 3
B
b) 7
C
c) 17
D
d) 31
Question 8
The average of 2, 7, 6 and x is 5 and the average of 18, 1, 6, x and y is 10. What is the value of y ?
 
A
a) 5
B
b) 10
C
c) 20
D
d) 30
Question 9
If the mean of 5 observations x, x + 2, x + 4, x + 6 and x + 8 is 11, then the mean of the last three observations is :
 
A
a) 11
B
b) 13
C
c) 15
D
d) 17
Question 10
 If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a² , b², c² is :
 
A
a) M²
B
b) 3M²
C
c) 6M²
D
d) 9M²
Question 11
The average of the two-digit numbers, which remain the same when the digits interchange their positions, is :
A
a) 33
B
b) 44
C
c) 55
D
d) 66
Question 12
The average of first 50 natural numbers is :
 
A
a) 12.25
B
b) 21.25
C
c) 25
D
d) 25.5
Question 13
 The mean of 1², 2², 3², 4², 5², 6², 7² is :
 
A
a) 10
B
b) 20
C
c) 30
D
d) 40
Question 14
The average of all odd numbers upto 100 is :
 
A
a) 49
B
b) 49.5
C
c) 50
D
d) 51
Question 15
   The average of a non-zero number and its square is 5 times the number. The number is :
 
A
a) 9
B
b) 17
C
c) 29
D
d) 295
Question 16
  The average of 7 consecutive numbers is 20. The largest of these numbers is :
 
A
a) 20
B
b) 22
C
c) 23
D
d) 24
Question 17
The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers ?
 
A
a) 2
B
b) 5
C
c) 8
D
d) Cannot be determined
Question 18

1.      The sum of three consecutive odd numbers is 38 more than the average of these numbers. What is the first of these numbers ?



A
a) 13
B
b) 17
C
c) 19
D
d) Data inadequate None of these
Question 19

1.     The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age of the whole class is :

A
a) 15 years
B
b) 15.5 years
C
c) 16 years
D
d) Cannot be computed with the given information
Question 20
 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 :
A
a) 53.33
B
c) 55
C
d) None of these
Question 21
The average marks of 16 boys in a class are 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average weight of all the boys in the class.
A
a) 47.55 kgs
B
b) 48 kgs
C
c) 48.55 kgs
D
d) 49.25 kgs
Question 22
A car owner buys petrol at Rs. 7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year ?
A
a) Rs. 7.89
B
b) Rs. 8
C
c) Rs. 8.50
D
d) Rs. 9
Question 23
The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then :
 
A
a) x = y + z
B
b) 2x = y + z
C
c) x = 2y + 2z
D
d) None of these
Question 24
 Out of 9 persons, 8 persons spent Rs. 30 each for their meals. The ninth one spent Rs. 20 more than the average expenditure of all the nine. The total money spent by all of them was :
 
A
a) Rs. 260
B
b) 290
C
c) 292.50
D
d) 400.50
Question 25
 The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded, then the average of the remaining numbers is nearly :
 
A
a) 28.32
B
b) 28.78
C
c) 29.27
D
d) 29.68
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