1
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
2
AIEEE 2003
+4
-1
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 2002
+4
-1
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average marks of the girls?
A
73
B
65
C
68
D
74
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