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JEE Main Math Class 12 Statistics Part 2 Questions
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© examsnet.com
Question : 7
Total: 28
If the variance of the frequency distribution is 160 , then the value of
k
∈
N
is
x
c
2c
3c
4c
5c
6c
f
2
1
1
1
1
1
[9 Apr 2024 Shift 2]
5
8
7
6
Validate
Solution:
👈: Video Solution
x
C
2C
3C
4C
5C
6C
f
2
1
1
1
1
1
x
=
(
2
+
2
+
3
+
4
+
5
+
6
)
C
7
=
22
C
7
Var
(
x
)
=
c
2
(
2
+
2
2
+
3
2
+
4
2
+
5
2
+
6
2
)
7
−
(
22
c
7
)
2
=
92
c
2
7
−
c
2
×
484
49
=
(
644
−
484
)
c
2
49
=
160
c
2
49
160
=
160
×
c
2
49
⇒
c
=
7
© examsnet.com
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