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Byju's Answer
Standard X
Mathematics
Direct Method of Finding Mean
The mean of ...
Question
The mean of
3
observations is
12
and mean of
5
observations is
4
the combined mean is
A
7
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B
8
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C
9
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D
10
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Solution
The correct option is
C
7
The no .of observations is
3
+
5
=
8
The sum of observations is
3
(
12
)
+
5
(
4
)
=
36
+
20
=
56
The mean is
56
8
=
7
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0
Similar questions
Q.
If the mean of a set of
15
observations is
12
and that of another set of
10
observations is
15
then find the mean of combined set.
Q.
A set of
7
observations has mean
10
and another set of
3
observations has mean
5
.
The mean of combined set is:
Q.
10
is the mean of a set of
7
observations and
5
is the mean of a set of
3
observations. The mean of the combined set is given by
Q.
Assertion :If mean of
7
observation is
10
& mean of set of
3
observation is
5
, then mean of combined set is
8.5
. Reason: If
¯
x
1
&
¯
x
2
be the mean of
n
1
&
n
2
observations respectively, then combined mean is
n
1
¯
x
1
+
n
2
¯
x
2
n
1
+
n
2
Q.
The mean of 5 observations is 12. If the mean of the first 3 observations is 10, then find the mean of the other two.
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