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Averages
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39
Set 2
18
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➤ Averages ➤ 2
Question 6
Q6.
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 ?
5
10
20
30
Question 7
Q7.
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 :
11
13
15
17
Question 8
Q8.
If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a
2
, b
2
, c
2
is :
M
2
3M
2
6M
2
9M
2
Question 9
Q9.
The average of the two digit numbers, which remain the same when the digits interchange their positions is :
33
44
55
66
Question 10
Q10.
The average of first 50 natural numbers is :
12.25
21.25
25
25.5
1
2
3
4
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