1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Change Language
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
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Change Language
The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observations of the set is increased by 2, then the median of the new set :
A
is increased by 2
B
is decreased by 2
C
is two times the original median
D
remains the same as that of the original set
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Five horses are in a race. Mr. A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is :
A
$${{2 \over 5}}$$
B
$${{4 \over 5}}$$
C
$${{3 \over 5}}$$
D
$${{1 \over 5}}$$
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
The trigonometric equation $${\sin ^{ - 1}}x = 2{\sin ^{ - 1}}a$$ has a solution for :
A
$$\left| a \right| \ge {1 \over {\sqrt 2 }}$$
B
$${1 \over 2} < \left| a \right| < {1 \over {\sqrt 2 }}$$
C
all real values of $$a$$
D
$$\left| a \right| \le {1 \over {\sqrt 2 }}$$
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