1
AIEEE 2005
MCQ (Single Correct Answer)
+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
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
If in a frequency 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
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Consider the following statements:
(a) Mode can be computed from histogram
(b) Median is not independent of change of scale
(c) Variance is independent of change of origin and scale.
Which of these is/are correct?
A
only (a)
B
only (b)
C
only (a) and (b)
D
(a), (b) and (c)
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
In a series of 2n observations, half of them equal $$a$$ and remaining half equal $$–a$$. If the standard deviation of the observations is 2, then $$|a|$$ equals
A
2
B
$$\sqrt 2 $$
C
$${1 \over n}$$
D
$${{\sqrt 2 } \over n}$$
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