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:

1.  11

2.  13

3.  15

4.  17

View Answer  
4
Correct Answer :

13


Explanation :
No Explanation available for this question

If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, b2, c2 is :

1.  M2

2.  3M2

3.  6M2

4.  9M2

View Answer  
4
Correct Answer :

3M2


Explanation :
No Explanation available for this question

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

1.  3

2.  7

3.  17

4.  31

View Answer  
4
Correct Answer :

7


Explanation :
No Explanation available for this question

The average of the two-digit numbers, which remain the same when the digits interchange their positions, is:

1.  33

2.  44

3.  55

4.  66

View Answer  
4
Correct Answer :

55


Explanation :
No Explanation available for this question

The average of first 50 numbers is:

1.  12.25

2.  21.25

3.  25

4.  25.5

View Answer  
4
Correct Answer :

25.5


Explanation :
No Explanation available for this question

The mean o 12, 22, 32, 42, 52, 62, 72 is:

1.  10

2.  20

3.  30

4.  40

View Answer  
4
Correct Answer :

20


Explanation :
No Explanation available for this question

The average of all odd numbers upto 100 is:

1.  49

2.  49.5

3.  50

4.  51

View Answer  
4
Correct Answer :

50


Explanation :
No Explanation available for this question

The average of a non-zero number and its square is 5 times the number. The number is:

1.  9

2.  17

3.  29

4.  295

View Answer  
4
Correct Answer :

9


Explanation :
No Explanation available for this question

The average of 7 consecutive numbers is 20. The largest of these numbers is:

1.  20

2.  22

3.  23

4.  24

View Answer  
4
Correct Answer :

23


Explanation :
No Explanation available for this question

The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers

1.  2

2.  5

3.  Cannot be determined

4.  None of these

View Answer  
4
Correct Answer :

Cannot be determined


Explanation :
No Explanation available for this question
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