1
AIEEE 2007
+4
-1
The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is
A
80
B
60
C
40
D
20
2
AIEEE 2006
+4
-1
Suppose a population A has 100 observations 101, 102,........, 200, and another population B has 100 observations 151, 152,......., 250. If VA and VB represent the variances of the two populations, respectively, then $${{{V_A}} \over {{V_B}}}$$ is
A
1
B
$${9 \over 4}$$
C
$${4 \over 9}$$
D
$${2 \over 3}$$
3
AIEEE 2005
+4
-1
If in a frequently distribution, the mean and median are 21 and 22 respectively, then its mode is approximately
A
20.5
B
22.0
C
24.0
D
25.5
4
AIEEE 2005
+4
-1
Let x1, x2,...........,xn be n observations such that

$$\sum {x_i^2} = 400$$ and $$\sum {{x_i}} = 80$$. Then a possible value of n among the following is
A
18
B
15
C
12
D
9
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