11.
The average of the, two – digit numbers, which
remain the same when the digits interchange their positions, is:
a)
33
b)
44
c)
55
d)
66
12.
The average of first 50 natural numbers is:
a)
12.25
b)
21.25
c)
25
d)
25.5
13.
The mean of 1², 2², 3², 4², 5²,6²,7² is:
a)
10
b)
20
c)
30
d)
40
14.
The average of all odd numbers up to 100 is:
a)
49
b)
49.5
c)
50
d)
51
15.
If a, b, c, d, e are five consecutive odd
numbers, their average is:
a)
5 (a +4 )
b)
abcde /5
c)
5 (a + b + c +d + e)
d)
None of these
ANSWERS
