1
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
2
AIEEE 2004
+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)
3
AIEEE 2004
+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
$${{\sqrt 2 } \over n}$$
4
AIEEE 2003
+4
-1
In an experiment with 15 observations on $$x$$, then following results were available:
$$\sum {{x^2}} = 2830$$, $$\sum x = 170$$
One observation that was 20 was found to be wrong and was replaced by the correct value 30. Then the corrected variance is
A
188.66
B
177.33
C
8.33
D
78.00
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