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Byju's Answer
Standard VIII
Mathematics
Introduction to Statistics
If the mean o...
Question
If the mean of observations x, 2x+1,2x+5 and 2x+9 is 30. What is the mean of first threeobservation?
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Solution
Given
,
mean
of
observation
x
,
2
x
+
1
,
2
x
+
5
and
2
x
+
9
=
30
⇒
x
+
2
x
+
1
+
2
x
+
5
+
2
x
+
9
4
=
30
⇒
7
x
+
15
4
=
30
⇒
7
x
+
15
=
120
⇒
7
x
=
105
⇒
x
=
15
Now
,
Mean
of
first
three
observation
=
x
+
2
x
+
1
+
2
x
+
5
3
=
5
x
+
6
3
=
5
×
15
+
6
3
=
81
3
=
27
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